Fix: Flask Route Returns 404 Not Found
How to fix Flask routes returning 404 — trailing slash redirect, Blueprint prefix issues, route not registered, debug mode, and common URL rule mistakes.
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Fix: Flask CORS Not Working
How to fix CORS errors in Flask — installing flask-cors correctly, handling preflight OPTIONS requests, configuring origins with credentials, route-specific CORS, and debugging missing headers.
Fix: Git Keeps Asking for Username and Password
How to fix Git repeatedly prompting for credentials — credential helper not configured, HTTPS vs SSH, expired tokens, macOS keychain issues, and setting up a Personal Access Token.
Fix: GitHub Actions Environment Variables Not Available Between Steps
How to fix GitHub Actions env vars and outputs not persisting between steps — GITHUB_ENV, GITHUB_OUTPUT, job outputs, and why echo >> $GITHUB_ENV is required.
Fix: Go panic: runtime error: invalid memory address or nil pointer dereference
How to fix Go nil pointer dereference panics — checking for nil before use, nil interface traps, nil map writes, receiver methods on nil, and defensive nil handling patterns.
Fix: Hibernate LazyInitializationException — Could Not Initialize Proxy
How to fix Hibernate LazyInitializationException — loading lazy associations outside an active session, fetch join, @Transactional scope, DTO projection, and Open Session in View.
Fix: Jest Snapshot Outdated — 1 snapshot obsolete
How to fix Jest snapshot failures — updating outdated snapshots, removing obsolete ones, fixing inline snapshots, preventing brittle snapshot tests, and managing snapshots in CI.
Fix: Linux OOM Killer Killing Processes (Out of Memory)
How to fix Linux OOM killer terminating processes — reading oom_kill logs, adjusting oom_score_adj, adding swap, tuning vm.overcommit, and preventing memory leaks.
Fix: Next.js CORS Error on API Routes
How to fix CORS errors in Next.js API routes — adding Access-Control headers, handling preflight OPTIONS requests, configuring next.config.js headers, and avoiding common proxy mistakes.
Fix: pandas merge() Key Error and Duplicate Columns (_x, _y)
How to fix pandas merge and join errors — KeyError on merge key, duplicate _x/_y columns, unexpected row counts, suffixes, and how to validate merge results.
Fix: PostgreSQL "sorry, too many clients already"
How to fix PostgreSQL 'sorry, too many clients already' error — checking active connections, using connection pooling with PgBouncer, tuning max_connections, fixing ORM pool settings, and finding connection leaks.
Fix: Prisma Unique Constraint Failed on the Fields
How to fix Prisma's 'Unique constraint failed on the fields' error — finding which field caused it, handling upserts, race conditions, and bulk insert deduplication.