All 972 errors
Every documented error, grouped by category. Use the search page if you know the message you are looking for.
AI 35 errors
- Anthropic API: 429 rate_limit_error (tokens per minute)
- Anthropic API: invalid_request_error on tool_use / tool_result
- Anthropic API: Overloaded (529)
- Anthropic API: prompt is too long / context window exceeded
- AWS Bedrock: AccessDeniedException (no access to the model)
- Azure OpenAI: DeploymentNotFound
- Claude: response blocked / safety refusal
- CUDA: driver version is insufficient for CUDA runtime version
- CUDA: no kernel image is available for execution on the device
- Gemini API: response blocked (finishReason: SAFETY)
- GitHub Copilot: authentication failed / no subscription
- Hugging Face: 401 Cannot access gated repo
- HuggingFace/PyTorch: CUDA version mismatch
- LangChain: OutputParserException, could not parse LLM output
- LangChain: Token limit exceeded for chain
- LLM: structured output does not match the requested JSON schema
- MCP: server connection failed / failed to start
- Mistral API: 422 Unprocessable Entity
- Ollama: connection refused on localhost:11434
- Ollama: model not found
- Ollama: model requires more system memory than is available
- OpenAI API: 429 rate limit exceeded
- OpenAI API: context_length_exceeded
- OpenAI Whisper: Maximum content size limit exceeded
- OpenAI: 429 insufficient_quota
- OpenAI: Incorrect API key provided
- OpenAI: model_not_found / model has been deprecated
- OpenAI: Unsupported parameter: 'max_tokens' is not supported with this model
- pgvector: expected N dimensions, not M
- PyTorch: CUDA out of memory
- PyTorch: Expected all tensors to be on the same device
- RAG: embedding dimension mismatch
- TensorFlow: Could not find GPU
- Transformers: this model requires trust_remote_code=True
- vLLM: KV cache out of memory
Ansible 10 errors
- Ansible: 'variable' is undefined
- Ansible: Host unreachable
- Ansible: Jinja2 template error
- Ansible: Module not found
- Ansible: Playbook syntax error
- Ansible: Privilege escalation password required
- Ansible: SSH connection timeout
- Ansible: The conditional check 'result.rc == 0' failed
- Ansible: Vault password not provided
- Ansible: you must install the sshpass program
API 14 errors
- API Gateway 413: Payload too large
- API: Bearer token missing or malformed
- API: CORS preflight request failed
- API: Endpoint deprecated
- API: HTTP method override not working
- API: Idempotency key conflict
- API: JSON schema validation failed
- API: Rate limit exceeded (per minute)
- API: Request payload too large
- API: Webhook signature verification failed
- GitHub API: You have exceeded a secondary rate limit
- GraphQL: Query complexity exceeded
- Stripe: card_declined
- Stripe: Webhook signature verification failed
Apple 10 errors
- Homebrew: Permission denied @ /usr/local
- macOS: cannot be opened because the developer cannot be verified
- macOS: dyld: Library not loaded
- macOS: errSecAuthFailed / Keychain access denied
- macOS: notarization failed (notarytool)
- macOS: Operation not permitted (Full Disk Access / TCC)
- macOS: xcrun: error: invalid active developer path
- macOS: zsh: command not found after Homebrew install (PATH)
- Xcode: Command PhaseScriptExecution failed with a nonzero exit code
- Xcode: Sandbox: rsync.samba deny(1) file-write-create
Auth 11 errors
- Auth0: Callback URL mismatch
- Google OAuth: Error 403: access_denied, app is in testing
- JWT: token used before issued / not valid yet
- Keycloak: Invalid parameter: redirect_uri
- MFA: challenge timeout / code expired
- Microsoft Entra ID: AADSTS50011 (redirect URI mismatch)
- OAuth 2: invalid_grant (PKCE code_verifier does not match)
- OIDC: nonce mismatch
- OIDC: unable to find a signing key that matches the kid
- Okta: invalid_client
- WebAuthn/Passkey: registration failed (NotAllowedError)
BigData 11 errors
- Airflow: Scheduler not running
- Databricks: Cluster terminated unexpectedly
- dbt: Compilation Error (model depends on a node that was not found)
- Flink: Checkpoint failed
- Hadoop: NameNode is in safe mode
- Hive: MetaStore connection failed
- Kafka: Consumer group rebalancing
- Snowflake: Warehouse suspended
- Spark: Executor Lost (OutOfMemoryError)
- Spark: org.apache.spark.SparkException: Task not serializable
- Spark: Total size of serialized results is bigger than spark.driver.maxResultSize
C# 12 errors
- .NET: NuGet restore failed
- .NET: The framework 'Microsoft.NETCore.App', version '8.0.0' was not found
- ASP.NET Core: Unable to resolve service for type while activating
- ASP.NET: Connection string not found in configuration
- Blazor: JavaScript interop call failed
- C#: CS8618 non-nullable property must contain a non-null value when exiting constructor
- C#: Deadlock in async/await
- C#: NullReferenceException
- EF Core: another instance with the same key value is already being tracked
- EF Core: Update-Database not recognized
- StackOverflowException
- TaskCanceledException
C++ 11 errors
- C++: relocation R_X86_64_32S can not be used when making a shared object
- C++: runtime error: signed integer overflow (UBSan)
- C++: Segmentation fault (core dumped)
- C++: undefined reference to `vtable for X'
- CMake Error: Could not find a package configuration file provided by X
- double free or corruption
- heap-use-after-free
- multiple definition of 'symbol'
- stack-buffer-overflow
- template argument deduction/substitution failed
- undefined reference to 'function'
Caching 10 errors
- Browser serving stale cache after deployment
- Cache stampede / thundering herd
- CDN: High cache miss ratio
- CloudFront: 403 Access Denied
- Memcached: SERVER_ERROR object too large for cache
- Memcached: SERVER_ERROR out of memory
- Redis: LOADING Redis is loading the dataset in memory
- Redis: MISCONF Redis is configured to save RDB snapshots but is unable to persist
- Redis: NOSCRIPT No matching script. Please use EVAL.
- Varnish: 503 Backend fetch failed
CI/CD 18 errors
- Bazel: no such target / no such package
- Bitbucket Pipelines: Memory limit exceeded
- CircleCI: Container ran out of memory
- GitHub Actions: Failed to save cache (unable to reserve cache)
- GitHub Actions: Invalid workflow file, unexpected value
- GitHub Actions: OIDC token request failed (not authorized)
- GitHub Actions: refusing to allow an OAuth App to create or update workflow
- GitHub Actions: Resource not accessible by integration
- GitHub Actions: Secret not available in fork PRs
- GitHub Actions: The runner has received a shutdown signal
- GitHub Actions: this action uses a deprecated Node version
- GitHub Actions: Usage limit exceeded
- GitLab CI: Artifact expired
- GitLab CI: jobs config should contain at least one visible job
- GitLab CI: No runner available
- Jenkins: Agent is offline
- Jenkins: Workspace cleanup failed
- Vercel build: framework detection failed
Client 21 errors
- Angular: Can't resolve all parameters
- Browser warning: Cookie has no SameSite attribute
- CORS policy error
- docker: permission denied
- Failed to fetch dynamically imported module
- FATAL ERROR: JavaScript heap out of memory
- [email protected]: Permission denied (publickey)
- IndentationError: unexpected indent
- Java: java.lang.ClassNotFoundException
- Java: java.lang.NullPointerException
- java.lang.OutOfMemoryError
- JSON parse error
- Mixed Content Error
- Module not found: Can't resolve 'X'
- ModuleNotFoundError: No module named 'X'
- npm EACCES: permission denied
- npm ERR! enoent ENOENT: no such file or directory, open 'package.json'
- React Hook useEffect has missing dependencies
- Safari: third-party cookie blocked (ITP)
- TypeScript: Cannot find module 'X'
- Vue template compilation failed
Cloud 25 errors
- AWS CloudFormation: Stack is in ROLLBACK_COMPLETE state and can not be updated
- AWS EC2: Instance limit exceeded
- AWS ECS: CannotPullContainerError, pull image manifest has been retried
- AWS IAM: Policy syntax error
- AWS Lambda: Function timeout
- AWS RDS: Connection timeout
- AWS S3: Access Denied
- AWS S3: PermanentRedirect, wrong regional endpoint
- AWS: AccessDenied when calling the AssumeRole operation
- AWS: ExpiredToken / The security token included in the request is expired
- AWS: MissingAuthenticationTokenException
- AWS: The security token included in the request is expired
- AWS: ThrottlingException: Rate exceeded
- Azure: Authentication failed
- Azure: AuthorizationFailed, the client does not have authorization
- Azure: MissingSubscriptionRegistration (resource provider not registered)
- Azure: Quota exceeded
- Azure: Resource not found
- GCP: does not have permission to act as the service account
- GCP: Permission denied
- GCP: Quota exceeded
- GCP: SERVICE_DISABLED (API has not been used in project before)
- Pulumi: the stack has pending operations
- Vault: permission denied (403)
- Vault: server is sealed
Dart 10 errors
- Dart: LateInitializationError: Field 'x' has not been initialized
- Dart: Null check operator used on a null value
- Dart: type 'Null' is not a subtype of type 'String' in type cast
- Flutter: A RenderFlex overflowed by 42 pixels on the right
- Flutter: No Material widget found
- Flutter: setState() called after dispose()
- Flutter: setState() or markNeedsBuild() called during build
- Flutter: the current Dart SDK version is X but package requires Y
- Flutter: Vertical viewport was given unbounded height
- Flutter/Dart: pub get failed (version solving failed)
Database 41 errors
- Cassandra: NoHostAvailable
- ClickHouse: Memory limit (total) exceeded
- CockroachDB: restart transaction (SQLSTATE 40001)
- DynamoDB: ProvisionedThroughputExceededException
- Elasticsearch: flood stage disk watermark exceeded
- Elasticsearch: mapper_parsing_exception, failed to parse field
- Elasticsearch: Shard allocation failed
- MongoDB: E11000 duplicate key error
- MongoDB: Server selection timed out
- MongoDB: Transaction numbers are only allowed on a replica set member or mongos
- MongoDB: Write concern error
- MySQL server has gone away (error 2006)
- MySQL: Authentication plugin 'caching_sha2_password' cannot be loaded
- MySQL: Duplicate entry 'x' for key 'PRIMARY'
- MySQL: Incorrect string value (utf8mb4 / emoji)
- MySQL: Lock wait timeout exceeded; try restarting transaction
- MySQL: Table 'db.Users' doesn't exist
- MySQL: Too many connections
- Oracle: ORA-12541: TNS:no listener
- pg_dump: server version mismatch, aborting
- PgBouncer: no more connections allowed (max_client_conn)
- PgBouncer: prepared statement already exists
- PostgreSQL: canceling statement due to lock timeout
- PostgreSQL: canceling statement due to statement timeout
- PostgreSQL: cannot execute INSERT in a read-only transaction
- PostgreSQL: could not resize shared memory segment, No space left on device
- PostgreSQL: could not serialize access due to concurrent update
- PostgreSQL: Deadlock detected
- PostgreSQL: FATAL: password authentication failed for user
- PostgreSQL: relation "x" does not exist
- PostgreSQL: too many connections
- Prisma: Unique constraint failed on the fields: (`x`)
- Redis Cluster: CROSSSLOT Keys in request don't hash to the same slot
- Redis: Max clients reached
- Redis: NOAUTH Authentication required
- Redis: OOM command not allowed when used memory > 'maxmemory'
- Redis: READONLY You can't write against a read only replica
- Redis: WRONGTYPE Operation against a key holding the wrong kind of value
- SQL Server: Transaction was deadlocked (Msg 1205)
- SQLite: database is locked (SQLITE_BUSY)
- Supabase/Postgres: new row violates row-level security policy
DNS 10 errors
Docker 27 errors
- Docker build: failed to compute cache key, not found
- Docker build: layer caching issues
- docker buildx: no builder instance found
- Docker Compose: dependency failed to start: container is unhealthy
- Docker Compose: network configuration error
- docker push: unauthorized: authentication required
- Docker registry: 429 too many requests
- docker-compose: command not found
- Docker: Cannot connect to the Docker daemon
- Docker: container name already in use
- Docker: could not find an available, non-overlapping IPv4 address pool
- docker: could not select device driver with capabilities: [[gpu]]
- Docker: error getting credentials - credential helper not installed
- Docker: exec /app/entrypoint.sh: permission denied
- Docker: exec format error (multi-arch)
- Docker: exec user process caused "exec format error"
- Docker: failed to solve (process did not complete successfully)
- Docker: image not found
- Docker: image's platform (linux/amd64) does not match the detected host
- docker: invalid reference format
- docker: manifest unknown
- Docker: no matching manifest for linux/arm64
- Docker: no space left on device
- Docker: OCI runtime create failed (executable file not found)
- Docker: port is already allocated
- Docker: pull rate limit exceeded
- Podman: short-name did not resolve to an alias
Elixir 9 errors
- Ecto: connection not available and request was dropped from queue
- Elixir: (FunctionClauseError) no function clause matching
- Elixir: (KeyError) key :name not found in: %{"name" => "ada"}
- Elixir: function Foo.bar/1 is undefined (module Foo is not available)
- Elixir: GenServer call timeout (exited in :gen_server.call)
- Elixir: Mix could not compile dependency
- Elixir: protocol Enumerable not implemented for nil of type Atom
- Phoenix: (Phoenix.Router.NoRouteError) no route found for GET /api/users
- Phoenix: WebSocket connection rejected by check_origin
Email 8 errors
Frontend 23 errors
- Angular: NG0100: ExpressionChangedAfterItHasBeenCheckedError
- Astro: client hydration mismatch
- Blocked aria-hidden on an element because its descendant retained focus
- CORS: web font blocked by Access-Control-Allow-Origin
- CSS: @import rules must precede all other rules
- Cumulative Layout Shift (CLS) too high
- DOMException: play() failed because the user didn't interact with the document
- esbuild: Could not resolve "X"
- Failed to load module script: expected a JavaScript module but got text/html
- FOUC: flash of unstyled content
- Next.js: Event handlers cannot be passed to Client Component props
- Next.js: Invalid src prop, hostname is not configured under images
- Nuxt: Hydration node mismatch
- React 19: useFormState is deprecated, use useActionState
- Remix/React Router: loader threw an unexpected Response
- ResizeObserver loop completed with undelivered notifications
- Rollup: "X" is not exported by "Y"
- Tailwind CSS v4: unknown at-rule @tailwind
- Vite: Failed to resolve import
- Vite: Outdated Optimize Dep, the page keeps reloading in dev
- Vite: the CJS build of Vite's Node API is deprecated
- Vue: [Vue warn]: Failed to resolve component
- webpack 5: BREAKING CHANGE - polyfill for Node core module removed
Git 20 errors
- git cherry-pick: conflict
- Git LFS: missing objects
- git: cannot lock ref
- Git: CONFLICT during rebase
- Git: Could not apply stash
- git: detected dubious ownership in repository
- git: error: pathspec 'x' did not match any file(s) known to git
- Git: failed to push some refs to ... (non-fast-forward)
- git: fatal: Authentication failed for 'https://github.com/...'
- Git: File size exceeds limit
- Git: Merge conflict
- git: object file is empty / loose object is corrupt
- git: refusing to merge unrelated histories
- Git: remote rejected (protected branch)
- git: RPC failed; HTTP 400 curl 22 / the remote end hung up unexpectedly
- git: SSL certificate problem: unable to get local issuer certificate
- Git: Submodule path not initialized
- Git: You are in 'detached HEAD' state
- git: You have divergent branches and need to specify how to reconcile them
- git: Your local changes to the following files would be overwritten by merge
Go 19 errors
- cannot find module providing package
- context canceled
- fatal error: all goroutines are asleep - deadlock!
- fatal error: concurrent map writes
- Go: build constraints exclude all Go files in ...
- go: cannot find main module; see 'go help modules'
- Go: checksum mismatch (SECURITY ERROR)
- Go: declared and not used
- Go: http: superfluous response.WriteHeader call
- Go: missing go.sum entry for module
- Go: module declares its path as X but was required as Y
- Go: module requires go >= 1.x (running go 1.y)
- Go: panic: assignment to entry in nil map
- Go: panic: runtime error: index out of range [3] with length 3
- Go: panic: send on closed channel
- go: toolchain not available
- go: updates to go.mod needed; to update it: go mod tidy
- goroutine leak detected
- interface conversion: interface is nil, not X
GraphQL 13 errors
- Apollo Client: Missing field 'x' while writing result to the cache
- Apollo Server: POST body missing, invalid Content-Type
- GraphQL: Cannot return null for non-nullable field
- GraphQL: Cannot spread fragment within itself
- GraphQL: Cannot use GraphQLSchema from another module or realm
- GraphQL: Expected type X, found Y
- GraphQL: Max query depth exceeded
- GraphQL: N+1 query problem
- GraphQL: Not authenticated
- GraphQL: PersistedQueryNotFound
- GraphQL: Syntax Error
- GraphQL: Validation error
- GraphQL: Variable "$id" of required type "ID!" was not provided
gRPC 10 errors
- gRPC-Web: response missing grpc-status trailer
- gRPC: ABORTED (code 10)
- gRPC: DEADLINE_EXCEEDED (code 4)
- gRPC: FAILED_PRECONDITION (code 9)
- gRPC: INTERNAL, received RST_STREAM with error code 2
- gRPC: INVALID_ARGUMENT (code 3)
- gRPC: PERMISSION_DENIED (code 7)
- gRPC: RESOURCE_EXHAUSTED, received message larger than max
- gRPC: UNAUTHENTICATED (code 16)
- gRPC: UNIMPLEMENTED (code 12)
HTTP 49 errors
- 100-continue timeout / Expect: 100-continue stalls
- 400 Bad Request
- 401 Unauthorized
- 402 Payment Required
- 403 Forbidden
- 404 Not Found
- 409 Conflict
- 410 Gone
- 421 Misdirected Request
- 422 Unprocessable Entity
- 425 Too Early
- 426 Upgrade Required
- 428 Precondition Required
- 429 Too Many Requests
- 431 Request Header Fields Too Large
- 451 Unavailable For Legal Reasons
- 500 Internal Server Error
- 502 Bad Gateway
- 503 Service Unavailable
- 504 Gateway Timeout
- 511 Network Authentication Required
- API rate limit exceeded (global)
- API version mismatch
- Chunk encoding error
- Compression bomb detected
- Content encoding error
- Content-Length mismatch
- Content-Type mismatch
- CSRF token mismatch
- Duplicate header error
- Expectation failed
- Geographic blocking
- HTTP header too large
- HTTP pipelining error
- HTTP request smuggling detected
- HTTP version not supported
- HTTP/2 protocol error
- Insufficient storage
- Invalid response headers
- Keep-alive timeout
- Method not allowed
- OAuth insufficient scope
- OAuth invalid token
- Payload too large
- Rate limit exceeded
- Request timeout
- Session expired
- Too many redirects
- Unsupported media type
ICMP 23 errors
- ICMP Communication Administratively Prohibited (Type 3, Code 13)
- ICMP Destination Host Unknown (Type 3, Code 7)
- ICMP Destination Network Unknown (Type 3, Code 6)
- ICMP Destination Unreachable (Type 3)
- ICMP Echo Request/Reply (Type 8/0)
- ICMP Fragmentation Needed (Type 3, Code 4)
- ICMP Host Administratively Prohibited (Type 3, Code 10)
- ICMP Host Precedence Violation (Type 3, Code 14)
- ICMP Host Unreachable (Type 3, Code 1)
- ICMP Host Unreachable for TOS (Type 3, Code 12)
- ICMP Information Request/Reply (Type 15/16)
- ICMP Network Administratively Prohibited (Type 3, Code 9)
- ICMP Network Unreachable (Type 3, Code 0)
- ICMP Network Unreachable for TOS (Type 3, Code 11)
- ICMP Parameter Problem (Type 12)
- ICMP Port Unreachable (Type 3, Code 3)
- ICMP Precedence Cutoff in Effect (Type 3, Code 15)
- ICMP Protocol Unreachable (Type 3, Code 2)
- ICMP Redirect (Type 5)
- ICMP Source Quench (Type 4)
- ICMP Source Route Failed (Type 3, Code 5)
- ICMP Time Exceeded (Type 11)
- ICMP Timestamp Request/Reply (Type 13/14)
Ingress 8 errors
- cert-manager: Order is pending / challenge failed to propagate
- Ingress: configuration-snippet annotation cannot be used
- Ingress: default backend - 404
- Ingress: path not matching any backend
- Ingress: TLS secret not found
- Ingress: too many redirects (redirect loop)
- IngressClass not found
- Kubernetes Ingress error
Java 19 errors
- Cannot get a connection, pool error
- ClassCastException
- ConcurrentModificationException
- Could not resolve dependencies
- Java: Cannot invoke "String.length()" because "s" is null
- Java: error: invalid target release: 21
- Java: java.lang.OutOfMemoryError: Java heap space
- Java: java.lang.OutOfMemoryError: Metaspace
- Java: NoClassDefFoundError: Could not initialize class X
- Java: NoSuchMethodError
- Java: PKIX path building failed, unable to find valid certification path
- Maven: Could not transfer artifact, transfer failed
- Spring Boot: BeanDefinitionOverrideException
- Spring Boot: Failed to configure a DataSource ('url' attribute is not specified)
- Spring Boot: IllegalStateException: Failed to load ApplicationContext
- Spring Boot: required a bean of type 'X' that could not be found
- Spring Boot: Web server failed to start (port 8080 was already in use)
- StackOverflowError
- UnsupportedClassVersionError
JavaScript 42 errors
- bun install: lockfile had changes, but lockfile is frozen
- Bun: Cannot find module
- Deno: PermissionDenied: Requires net/read access
- ESLint: could not find an eslint.config.js file
- JavaScript: 'this' is undefined in callback
- JavaScript: Closure capturing wrong loop variable
- JavaScript: CORS credentials not allowed
- JavaScript: Memory leak from event listeners
- JavaScript: Race condition in async operations
- JavaScript: Unhandled promise rejection
- Next.js 15: `params` should be awaited before using its properties
- Next.js: Dynamic server usage (route couldn't be rendered statically)
- Next.js: Hydration failed because the initial UI does not match
- Next.js: You're importing a component that needs useState in a Server Component
- Node.js: DeprecationWarning: The `punycode` module is deprecated
- Node.js: ERR_MODULE_NOT_FOUND (missing file extension)
- Node.js: ERR_REQUIRE_ESM
- Node.js: ERR_UNSUPPORTED_DIR_IMPORT
- Node.js: error:0308010C:digital envelope routines::unsupported
- Node.js: MaxListenersExceededWarning: possible EventEmitter memory leak
- Node.js: node-gyp build failed
- Node.js: TypeError: fetch failed
- npm ci: package.json and package-lock.json are not in sync
- npm ERR! code E401 on a private registry
- npm ERR! code ELIFECYCLE
- npm ERR! ERESOLVE unable to resolve dependency tree
- npm error code EJSONPARSE
- npm: EBADENGINE Unsupported engine
- npm: Network socket timeout
- pnpm: ERR_PNPM_OUTDATED_LOCKFILE
- RangeError: Maximum call stack size exceeded
- React: Cannot update a component while rendering a different component
- React: Each child in a list should have a unique "key" prop
- React: Hydration failed because the initial UI does not match
- React: Rendered more hooks than during the previous render
- React: Too many re-renders
- ReferenceError: window is not defined
- Tailwind CSS class does not appear in built CSS
- TypeError: Cannot read properties of undefined (reading 'X')
- TypeScript: Type 'null' is not assignable to type 'string'
- Vite: JavaScript heap out of memory during build
- Yarn PnP: a package tried to access an undeclared dependency
Kubernetes 34 errors
- Argo CD: Application OutOfSync / Degraded
- Helm: another operation (install/upgrade) is in progress
- Helm: cannot patch (field is immutable)
- Helm: release stuck in failed or pending state
- Istio: 503 upstream connect error (UH/UF/NR)
- kubectl apply: metadata.annotations: Too long
- kubectl top: error: Metrics API not available
- kubectl: error: You must be logged in to the server (Unauthorized)
- kubectl: The connection to the server localhost:8080 was refused
- Kubernetes: 0/N nodes are available, node(s) had untolerated taint
- Kubernetes: admission webhook denied the request
- Kubernetes: context deadline exceeded
- Kubernetes: CrashLoopBackOff
- Kubernetes: CreateContainerConfigError
- Kubernetes: Deployment exceeded its progress deadline
- Kubernetes: exceeded quota in namespace
- Kubernetes: Failed to create pod sandbox
- Kubernetes: Forbidden - RBAC denies access
- Kubernetes: HorizontalPodAutoscaler unable to get metrics for resource cpu
- Kubernetes: ImagePullBackOff
- Kubernetes: Init:CrashLoopBackOff
- Kubernetes: Insufficient CPU/Memory
- Kubernetes: no matches for kind in version (removed API)
- Kubernetes: Node status NotReady
- Kubernetes: node(s) didn't match Pod's node affinity/selector
- Kubernetes: OOMKilled
- Kubernetes: PersistentVolumeClaim Pending
- Kubernetes: Pod evicted - node was low on resource
- Kubernetes: pod has unbound immediate PersistentVolumeClaims
- Kubernetes: Pod Security Policy violation
- Kubernetes: Readiness probe failed, endpoints never become ready
- Kubernetes: Service has no endpoints
- Kubernetes: Unable to attach or mount volumes, timed out
- Kubernetes: violates PodSecurity restricted:latest
Logging 9 errors
- CloudWatch Logs: Rate exceeded (ThrottlingException)
- Fluentd: Buffer overflow
- journalctl: No journal files were found
- Log4j: Appender not found
- Logback: Failed to create log file
- logrotate: skipping because parent directory has insecure permissions
- Logstash: Pipeline error
- Loki: entry too far behind / out of order
- systemd-journald: Suppressed 1234 messages from /system.slice/app.service
MessageQueue 14 errors
- AWS SQS: Message too large (256KB limit)
- Celery: WorkerLostError
- Kafka: LEADER_NOT_AVAILABLE
- Kafka: Offset out of range
- Kafka: RecordTooLargeException
- Kafka: Topic authorization failed
- Kafka: UNKNOWN_TOPIC_OR_PARTITION
- Message Queue: Consumer lag too high
- Message Queue: Poison message blocking queue
- NATS: Slow consumer detected
- RabbitMQ: connection blocked by a resource alarm
- RabbitMQ: Connection refused
- RabbitMQ: PRECONDITION_FAILED - inequivalent arg for queue
- RabbitMQ: Queue length limit exceeded
Mobile 17 errors
- Android Studio: Gradle sync failed
- Android: DEX method limit exceeded (64k)
- Android: Duplicate class found in modules
- Android: INSTALL_FAILED_UPDATE_INCOMPATIBLE
- Android: Manifest merger failed with multiple errors, see logs
- Android: SDK location not found. Define a valid SDK location
- CocoaPods: The sandbox is not in sync with the Podfile.lock
- Expo EAS: build failed (Gradle/Xcode step exited with non-zero code)
- Flutter: Android toolchain - develop for Android devices
- Gradle: Execution failed for task ':app:...'
- iOS: Code signing is required
- Kotlin: Unresolved reference: X
- React Native: Metro Bundler error
- React Native: Unable to load script. Make sure you're running Metro
- Swift: Cannot convert value of type X to expected argument type Y
- Xcode: Build input file cannot be found
- Xcode: No profiles for 'com.example.app' were found
Monitoring 12 errors
- CloudWatch Alarm: INSUFFICIENT_DATA
- Datadog: Agent not reporting data
- Grafana: Data source connection error
- Grafana: Panel plugin not found
- Jaeger: spans dropped
- OpenTelemetry Collector: exporter queue is full
- OpenTelemetry: connection refused exporting to the collector
- Prometheus: context deadline exceeded (scrape)
- Prometheus: out-of-order sample / duplicate sample for timestamp
- Prometheus: sample limit exceeded
- Prometheus: Target down
- Sentry: Rate limit exceeded
Network 35 errors
- Bandwidth limit exceeded
- bind: address already in use (EADDRINUSE)
- chrony/NTP: clock not synchronised (Leap status: Not synchronised)
- Circuit breaker open
- Connection pool exhausted
- Connection refused
- Connection reset by peer
- Connection timeout
- Database connection timeout
- Database deadlock
- Docker network error
- Elasticsearch cluster unavailable
- Firewall blocking connection
- gRPC unavailable
- IPv6: Network is unreachable / no route to host
- kubectl: connection refused
- Linux: duplicate IPv4 address detected on the network
- Linux: possible SYN flooding on port X, sending cookies
- Memory allocation failed
- MongoDB connection timeout
- MTU mismatch / fragmentation needed but DF set
- MySQL: Access denied for user
- Network changed
- Network is unreachable
- Port unreachable
- psql: connection to server refused
- QUIC handshake failed / UDP 443 blocked
- Redis connection error
- Service mesh routing error
- ssh: connect to host X port 22: Connection refused
- WebRTC: ICE connection failed
- WebSocket connection failed
- WebSocket frame too large
- WebSocket protocol error
- WebSocket upgrade failed
Performance 6 errors
- Container CPU throttling: nr_throttled rising in cpu.stat
- java.lang.OutOfMemoryError: GC overhead limit exceeded
- Long GC pause / stop-the-world latency spike
- Node.js: event loop lag / blocked synchronously
- Node.js: high latency from synchronous crypto or JSON on the event loop
- Thread pool starvation / requests queueing behind blocked threads
PHP 11 errors
- Allowed memory size exhausted
- Class 'X' not found
- Laravel: 419 Page Expired
- Laravel: Target class [X] does not exist
- Maximum execution time exceeded
- PHP 8.4: Implicitly marking parameter as nullable is deprecated
- PHP-FPM: server reached pm.max_children setting, consider raising it
- PHP: Fatal error: Call to a member function x() on null
- SQLSTATE[HY000]: Connection refused
- Undefined index / Undefined array key
- Your requirements could not be resolved to an installable set of packages
Proxy 17 errors
- Caddy upstream error
- Cloudflare 520: Web server returns an unknown error
- Cloudflare 522: Connection timed out
- Cloudflare 524: A timeout occurred
- Cloudflare error
- Cloudflare Worker 1101 runtime error
- Envoy upstream reset
- HAProxy server error
- Load balancer error
- Nginx: no live upstreams while connecting to upstream
- Nginx: Upstream request timeout
- nginx: upstream sent too big header while reading response header
- Proxy authentication required
- Proxy connection failed
- Proxy tunnel failed
- Traefik backend not found
- Upstream connect error
Python 35 errors
- asyncio: Task was destroyed but it is pending!
- Django: Forbidden (403) CSRF verification failed. Request aborted.
- Django: ImproperlyConfigured: setting is not configured
- Django: OperationalError: no such table
- FastAPI: ResponseValidationError
- pip: No matching distribution found for X
- pip: SSL Certificate Verify Failed
- Poetry: pyproject.toml changed significantly since poetry.lock was generated
- Pydantic v2: ValidationError after upgrade from v1
- Python 3.12: ModuleNotFoundError: No module named 'distutils'
- Python 3.13: ModuleNotFoundError: No module named 'cgi'
- Python pandas: Memory error loading large CSV
- Python: An attempt has been made to start a new process before bootstrapping
- Python: AttributeError: 'NoneType' object has no attribute 'X'
- Python: Cannot pickle local object in multiprocessing
- Python: Circular import detected
- Python: Deadlock with threading and GIL
- Python: error: externally-managed-environment
- Python: Event loop is closed
- Python: GIL causing performance bottleneck
- Python: ImportError: attempted relative import with no known parent package
- Python: JSONDecodeError: Expecting value: line 1 column 1 (char 0)
- Python: KeyError on dict access
- Python: module compiled with NumPy 1.x cannot be run in NumPy 2.x
- Python: Package version conflict
- Python: RecursionError: maximum recursion depth exceeded
- Python: RuntimeError: dictionary changed size during iteration
- Python: RuntimeError: no running event loop
- Python: SyntaxWarning: invalid escape sequence '\d'
- Python: TypeError: Object of type datetime is not JSON serializable
- Python: UnicodeDecodeError: 'utf-8' codec can't decode byte
- Python: Unpickling error - module not found
- SQLAlchemy: DetachedInstanceError, parent instance is not bound to a Session
- uv: No solution found when resolving dependencies
- uv: the lockfile is out of date
Regex 8 errors
- Python: re.error: bad escape \d at position 0
- Regex: Catastrophic backtracking (ReDoS)
- Regex: Invalid back reference
- Regex: Invalid regular expression - unexpected character
- Regex: Lookbehind not supported
- Regex: nothing to repeat at position 0
- Regex: test() returns false every other call with the /g flag
- Regex: unbalanced parenthesis / missing closing bracket
Ruby 11 errors
- Bundler: Could not find gem
- Encoding::InvalidByteSequenceError
- LoadError: cannot load such file
- Rails: ActionController::InvalidAuthenticityToken
- Rails: Asset not precompiled
- Rails: No route matches
- Rails: PendingMigrationError
- Ruby: can't modify frozen String
- Ruby: Failed to build gem native extension
- Ruby: syntax error, unexpected end-of-input
- Ruby: Your Ruby version is 3.3.5, but your Gemfile specified 3.2.2
Rust 19 errors
- cannot borrow as mutable, as it is behind a & reference
- cannot move out of borrowed content
- Cargo: Blocking waiting for file lock on package cache
- Cargo: lock file version requires a newer version of Cargo
- failed to select a version for X
- mismatched types: expected X, found Y
- Rust: called `Option::unwrap()` on a `None` value
- Rust: cannot borrow `*self` as mutable because it is also borrowed as immutable
- Rust: cannot borrow `x` as mutable more than once at a time
- Rust: could not compile, process didn't exit successfully (signal: 9, SIGKILL)
- Rust: error: linker `link.exe` not found
- Rust: future cannot be sent between threads safely
- Rust: linking with `cc` failed
- Rust: recursive type has infinite size (E0072)
- Rust: temporary value dropped while borrowed (E0716)
- Rust: the `?` operator could not convert the error (E0277)
- the trait X is not implemented for Y
- Tokio: Cannot start a runtime from within a runtime
- unused Result that must be used
Scala 6 errors
Security 25 errors
- Cookie: SameSite=None requires the Secure attribute
- CORS: credentialed request cannot use a wildcard origin
- CSP: Refused to connect to URL
- CSP: Refused to execute inline script because it violates the policy
- CSRF: Token invalid or missing
- GitHub: push declined due to repository rule violations, secret detected
- JWT: Invalid audience claim
- JWT: Token expired
- Kerberos: KRB_AP_ERR_SKEW / clock skew too great
- LDAP: invalid credentials / AD data 52e
- OAuth: redirect_uri_mismatch
- OAuth: Token revoked
- OAuth2: invalid_grant (refresh token expired)
- SAML: invalid signature on assertion / response
- Security: JWT algorithm confusion attack
- Security: Path traversal vulnerability
- Security: Required security header missing
- Security: SQL injection vulnerability detected
- SELinux: Permission denied
- SSH: Host key verification failed
- ssh: no matching host key type found. Their offer: ssh-rsa
- SSH: Permissions 0644 for 'id_rsa' are too open
- ssh: Received disconnect: Too many authentication failures
- Subresource Integrity check failed
- Trivy: build failed on HIGH and CRITICAL vulnerabilities
Serverless 11 errors
- AWS Lambda: ENI limit reached in VPC
- AWS Lambda: Internal server error, malformed Lambda proxy response
- AWS Lambda: Runtime exited with error: signal: killed
- AWS Lambda: Runtime.ImportModuleError
- AWS Lambda: Task timed out after X seconds
- AWS Lambda: Unzipped size exceeds 250MB limit
- Azure Functions: Host not running
- Cloudflare Worker: Script size exceeds limit
- GCP Cloud Functions: Deployment failed
- Serverless Framework: UPDATE_ROLLBACK_COMPLETE
- Vercel: 504 FUNCTION_INVOCATION_TIMEOUT
Shell 13 errors
- bash: $'\r': command not found
- bash: Argument list too long
- bash: bad interpreter: No such file or directory
- bash: bad substitution
- bash: command not found
- bash: Permission denied
- bash: syntax error near unexpected token
- bash: unbound variable
- bash: warning: setlocale: LC_ALL: cannot change locale
- Make: *** missing separator. Stop.
- PowerShell: File is not digitally signed
- sed: -i may not be used with stdin / extra characters after command (macOS)
- zsh: no matches found
Storage 13 errors
- AWS S3: Access Denied on an object encrypted with KMS
- AWS S3: Bucket does not exist
- AWS S3: SignatureDoesNotMatch
- AWS: EBS volume not available in AZ
- Azure Blob: Lease conflict
- Browser: Storage quota exceeded
- Ceph: OSD down
- Google Cloud Storage: Signed URL expired
- Linux: mount error(13): Permission denied (CIFS/SMB)
- NFS: Mount timeout
- NFS: Stale file handle
- S3: Access denied by bucket policy
- S3: Eventual consistency causing read-after-write issues
Svelte 10 errors
- Svelte 5: `$effect` can only be used inside an effect
- Svelte 5: `$props()` can only be used at the top level of components
- Svelte 5: `export let` is not allowed in runes mode, use `$props()` instead
- Svelte 5: $state / $derived can only be used inside a .svelte or .svelte.js file
- Svelte 5: State referenced in its own scope will never update
- Svelte 5: Updating state inside a derived is forbidden
- Svelte: '$' prefix can only be used with stores
- SvelteKit: 500 error in load function
- SvelteKit: Cannot prerender pages with actions
- SvelteKit: Data returned from `load` is not serializable
System 26 errors
- apt: Could not get lock /var/lib/dpkg/lock-frontend
- bash: fork: retry: Resource temporarily unavailable
- Cron: Job not running
- ENOSPC: System limit for number of file watchers reached
- Go: import cycle not allowed
- Go: panic: runtime error: invalid memory address or nil pointer dereference
- GPG: BAD signature / cannot verify signature
- Linux: No space left on device
- Linux: Read-only file system
- Linux: Too many levels of symbolic links (ELOOP)
- macOS: app is damaged and can't be opened / Gatekeeper blocked
- PowerShell: .ps1 cannot be loaded because running scripts is disabled
- Rust: borrow of moved value
- Rust: lifetime mismatch
- ssh: Could not open a connection to your authentication agent
- sudo: unable to resolve host
- System: OOM killer terminated process
- System: Segmentation fault (core dumped)
- System: Too many open files
- System: Zombie process accumulation
- systemd: Failed to start (unit is masked)
- systemd: Start operation timed out
- systemd: start request repeated too quickly, refusing to start
- systemd: Unit failed to start
- Windows: MSI installer error 1603
- WSL2: Error 0x80370102 / vmcompute not running
Terraform 18 errors
- OpenTofu: state is encrypted but no key provider is configured
- Terraform: An argument named "x" is not expected here
- Terraform: Cannot import resource - not found
- Terraform: Cycle (resources depend on each other)
- Terraform: Cycle dependency detected
- Terraform: Failed to install provider, could not query provider registry
- Terraform: for_each value depends on resource attributes that cannot be determined
- Terraform: Inconsistent dependency lock file
- Terraform: Instance cannot be destroyed (prevent_destroy)
- Terraform: Invalid count argument (value depends on resource attributes)
- Terraform: Plugin crashed
- Terraform: Provider authentication failed
- Terraform: provider checksum list has no SHA-256 hash
- Terraform: Provider not found
- Terraform: Provider produced inconsistent final plan
- Terraform: Remote backend configuration error
- Terraform: Resource already exists
- Terraform: State locked
Testing 18 errors
- Cypress: Cypress detected a cross origin error
- Cypress: Timed out retrying - Expected to find element
- Jest: Cannot find module
- Jest: Exceeded timeout of 5000 ms for a test
- Jest: Snapshot does not match stored snapshot
- Jest: SyntaxError: Cannot use import statement outside a module
- Jest: You are trying to import a file after the Jest environment has been torn down
- Jest: Your test suite must contain at least one test.
- JUnit: No runnable methods
- Playwright: browserType.launch (executable doesn't exist)
- Playwright: strict mode violation (locator resolved to multiple elements)
- Playwright: Timeout exceeded waiting for element
- pytest: async def functions are not natively supported
- pytest: Collection error
- pytest: fixture 'X' not found
- Testing Library: Unable to find an element with the text
- Vitest: No test suite found in file
- Vitest: ReferenceError: document is not defined
TLS 24 errors
- Apache mod_ssl error
- Certificate chain incomplete
- Certificate has expired
- Client certificate required
- curl: (56) OpenSSL SSL_read: Connection reset by peer
- ERR_SSL_PROTOCOL_ERROR
- Hostname verification failed
- Invalid SSL certificate
- Mutual TLS verification failed
- OpenSSL: unsafe legacy renegotiation disabled
- PEM error: no start line / unable to load private key
- Protocol downgrade detected
- SSL certificate validation failed
- SSL handshake failed
- SSL peer certificate verification failed
- SSL renegotiation failed
- SSL SNI (Server Name Indication) error
- SSL version or cipher mismatch
- SSL version rollback attack
- SSL weak cipher rejected
- TLS: certificate is not yet valid
- TLS: SSL_ERROR_SYSCALL / connection reset during handshake
- TLS: unable to get local issuer certificate
- x509: certificate signed by unknown authority
TypeScript 19 errors
- TypeScript: 'error' is of type 'unknown' (TS18046)
- TypeScript: Argument of type X is not assignable to parameter of type Y
- TypeScript: Cannot find module './x.js' or its corresponding type declarations
- TypeScript: Cannot find name 'process'
- TypeScript: Cannot redeclare block-scoped variable 'name'
- TypeScript: Cannot use JSX unless the '--jsx' flag is provided
- TypeScript: Could not find a declaration file for module
- TypeScript: Module can only be default-imported using the 'esModuleInterop' flag
- TypeScript: No overload matches this call
- TypeScript: Object is possibly 'undefined'
- TypeScript: Option 'module' must be set to 'NodeNext'
- TypeScript: Parameter 'x' implicitly has an 'any' type (TS7006)
- TypeScript: Property 'X' does not exist on type 'Y'
- TypeScript: The inferred type of X cannot be named without a reference to Y
- TypeScript: Two different types with this name exist, but they are unrelated
- TypeScript: Type 'X' is not assignable to type 'Y'
- TypeScript: Type instantiation is excessively deep (TS2589)
- TypeScript: Type X does not satisfy the constraint Y
- TypeScript: type-only import must use 'import type' (verbatimModuleSyntax)
Virtualization 8 errors
Web3 7 errors
- Web3: execution reverted
- Web3: gas required exceeds allowance (0)
- Web3: insufficient funds for gas * price + value
- Web3: intrinsic gas too low
- Web3: max fee per gas less than block base fee
- Web3: missing revert data in call exception (CALL_EXCEPTION)
- Web3: nonce too low / replacement transaction underpriced
WebAssembly 7 errors
- WebAssembly: Cannot enlarge memory arrays
- WebAssembly: CompileError - invalid magic / section
- WebAssembly: incorrect response MIME type (expected application/wasm)
- WebAssembly: null function or function signature mismatch
- WebAssembly: RuntimeError - memory access out of bounds
- WebAssembly: RuntimeError: unreachable executed
- WebAssembly: SharedArrayBuffer is not defined
WebServer 10 errors
- Apache: .htaccess: Option Indexes not allowed
- Apache: AH00558: Could not reliably determine the server's FQDN
- Apache: mod_rewrite not enabled
- Caddy: 502 Bad Gateway (reverse proxy)
- IIS: HTTP Error 500.19 - Internal Server Error
- Nginx: 413 Request Entity Too Large
- Nginx: bind() to 0.0.0.0:80 failed
- Nginx: could not build server_names_hash, increase the bucket size
- Nginx: no shared cipher (SSL)
- Nginx: open() failed (13: Permission denied)
Windows 10 errors
- Windows Update: error 0x80070643
- Windows: 'x' is not recognized as an internal or external command
- Windows: 0xc000007b application unable to start correctly
- Windows: Access is denied (error 5)
- Windows: bind failed, the port is excluded by the Hyper-V dynamic port range
- Windows: corrupted system files / component store
- Windows: RDP can't connect (CredSSP encryption oracle remediation)
- Windows: The process cannot access the file because it is being used
- Windows: The specified path, file name, or both are too long (MAX_PATH)
- Windows: VCRUNTIME140.dll was not found