Error categories

Android Android, Gradle and ADB build/install errors. 50 iOS Xcode, Swift, CocoaPods and code-signing errors. 51 Linux Linux shell, permission and package-manager errors. 51 macOS macOS errors — Gatekeeper, permissions, Homebrew, developer tools and system settings. 3 Windows Windows system error codes and stop codes. 51

Angular Angular errors (NG0100, NullInjectorError, NG8002…) — change detection, dependency injection and templates. 53 Flutter / Dart Flutter and Dart errors — layout overflows, state lifecycle, null safety and build problems. 3 Laravel Laravel framework errors — routing, Eloquent, validation, configuration and deployment — with artisan fixes. 3 Next.js Next.js App Router and Pages Router errors — server/client components, rendering, routing and build failures. 3 Node.js Node.js runtime errors: module resolution, ports in use, file system and network errno codes. 52 React React runtime and build errors: invalid children, infinite re-renders, hooks and keys. 51 Vue Vue.js warnings and errors — components, props, reactivity, Pinia and Nuxt. 3 WordPress WordPress database, plugin, theme and server errors. 50

API REST/GraphQL API errors: invalid tokens, CORS, rate limits, timeouts and malformed requests. 54 Authentication Login, session, JWT and OAuth 2.0 / OpenID Connect errors. 50 Browser Chrome, Edge, Firefox and Safari error pages (ERR_ codes, connection and certificate errors) and how to fix them. 53 Cloudflare Cloudflare 5xx errors (520–526) between the edge and your origin server. 50 Email / SMTP SMTP bounce codes (550, 554, 5.7.x), SPF/DKIM/DMARC rejections and mail delivery errors explained. 3 HTTP HTTP status codes from 400 Bad Request to 504 Gateway Timeout — what they mean and how to fix them on any server. 51 Nginx / Apache Nginx and Apache web server errors — config tests, upstream timeouts, PHP-FPM, permissions and virtual hosts. 3 SSL / TLS SSL/TLS certificate errors — Let’s Encrypt, name mismatches, chains, PEM files and protocol problems. 3

AWS Amazon Web Services errors: IAM AccessDenied, expired tokens, throttling and S3 issues. 51 Azure Microsoft Azure authentication (AADSTS) and deployment errors. 50 CI/CD GitHub Actions, GitLab CI and Jenkins pipeline errors — permissions, runners, checkout and scripts. 53 Docker Docker daemon, image, container, port and disk errors. 51 Git Git and GitHub errors: rejected pushes, merge conflicts, SSH keys and unrelated histories. 51 Google Cloud / Firebase Google Cloud (Cloud Run, GKE, IAM, gcloud) and Firebase (Firestore, Hosting, Functions) errors with fixes. 3 Kubernetes Pod states and cluster errors: CrashLoopBackOff, ImagePullBackOff, OOMKilled. 50 npm npm install and dependency errors: ERESOLVE, EACCES, lockfile and registry problems. 50 Terraform Terraform and OpenTofu errors — state locks, providers, lock files, references and plans. 3

C/C++ C and C++ compiler, linker and runtime errors — undefined references, segfaults, memory corruption and exceptions. 53 Go Go (Golang) compile errors, runtime panics and module problems with idiomatic fixes. 3 Java Java and JVM exceptions: NullPointerException, ClassNotFoundException, OutOfMemoryError. 50 JavaScript Browser and runtime JavaScript errors: TypeError, ReferenceError, SyntaxError and promise rejections. 50 .NET .NET runtime and ASP.NET Core exceptions. 50 PHP PHP fatal errors, warnings, parse errors and configuration limits. 50 Python Python exceptions: ImportError, KeyError, TypeError, IndentationError and more. 53 Ruby / Rails Ruby and Ruby on Rails errors — NoMethodError, ActiveRecord, migrations, routing and authenticity tokens. 3 Rust Rust compiler errors (E0382, E0502, E0308…) — ownership, borrowing, lifetimes and types — explained simply. 3 TypeScript TypeScript compiler errors (TS2322, TS2345, TS7006…) explained with fixes for strict mode, generics and type declarations. 3

MongoDB MongoDB and Mongoose errors — connection strings, authentication, validation and duplicate keys. 3 MySQL MySQL and MariaDB error codes like 1045, 1064, 1146 and 2002. 50 PostgreSQL PostgreSQL connection, authentication and query errors. 53 Redis Redis errors — memory limits, persistence, replicas, authentication and data types. 3 SQL Database-agnostic SQL errors: syntax, constraints, deadlocks and connection issues. 51