Fix: PostgreSQL ERROR: duplicate key value violates unique constraint
How to fix 'duplicate key value violates unique constraint' in PostgreSQL by resetting sequences, using upserts, fixing bulk imports, and handling concurrent inserts.
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830 articles — Page 65 of 70
Fix: Go declared and not used / imported and not used (compile error)
How to fix 'declared and not used' and 'imported and not used' compile errors in Go. Covers blank identifiers, goimports, gopls, build tags, conditional compilation, and common edge cases.
Fix: React useEffect runs infinitely (infinite loop / maximum update depth exceeded)
How to fix useEffect infinite loops in React — covers missing dependency arrays, referential equality, useCallback, unconditional setState, data fetching cleanup, event listeners, useRef, previous value comparison, and the exhaustive-deps lint rule.
Fix: E: Unable to locate package (apt-get install on Ubuntu/Debian)
How to fix the 'E: Unable to locate package' error in apt-get on Ubuntu and Debian, including apt update, missing repos, Docker images, PPA issues, and EOL releases.
Fix: ESLint Parsing error: Unexpected token (JSX, TypeScript, ES modules)
How to fix ESLint 'Parsing error: Unexpected token' for JSX, TypeScript, and ES module syntax by configuring the correct parser, parserOptions, and ESLint config format.
Fix: CONFLICT (content): Merge conflict in file — fix conflicts and then commit the result
How to fix Git merge conflicts during merge, rebase, cherry-pick, and pull — resolve conflict markers, use merge tools, accept theirs or ours, abort, and prevent future conflicts.
Fix: ImportError: cannot import name 'X' from partially initialized module (circular import)
How to fix Python's circular import error: ImportError cannot import name from partially initialized module. Covers lazy imports, module restructuring, TYPE_CHECKING, Django, Flask, and more.
Fix: Docker no space left on device (build, pull, or run)
How to fix the 'no space left on device' error in Docker when building images, pulling layers, or running containers, with cleanup and prevention strategies.
Fix: CORS preflight request blocked — Response to preflight does not have HTTP ok status
How to fix 'Response to preflight request doesn't pass access control check' and 'preflight channel did not succeed' CORS errors by handling OPTIONS requests, setting correct headers, and configuring your server.
Fix: Module parse failed: Unexpected token (Webpack / Vite / esbuild)
How to fix 'Module parse failed: Unexpected token' in Webpack, Vite, and esbuild by configuring the correct loaders and transforms for JSX, TypeScript, CSS, JSON, and other file types.
Fix: Terraform Failed to install provider (or Failed to query available provider packages)
How to fix 'Failed to install provider' and 'Failed to query available provider packages' errors in Terraform, covering registry issues, version constraints, network problems, platform support, and air-gapped environments.
Fix: django.db.utils.OperationalError: no such table (SQLite / PostgreSQL / MySQL)
How to fix Django's 'OperationalError: no such table' error caused by missing migrations, wrong database configuration, corrupted files, or Docker volume issues.