Fix: git fatal: A branch named 'x' already exists
How to fix 'git fatal: A branch named already exists' when creating or renaming branches, including local conflicts, remote tracking branches, and worktree issues.
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Fix: UnhandledPromiseRejectionWarning / UnhandledPromiseRejection
How to fix UnhandledPromiseRejectionWarning in Node.js and unhandled promise rejection errors in JavaScript caused by missing catch handlers, async/await mistakes, and event emitter errors.
Fix: Jest Timeout — Exceeded timeout of 5000ms for a test
How to fix Jest 'Exceeded timeout of 5000ms for a test' errors caused by unresolved promises, missing done callbacks, async/await mistakes, and slow database or network calls in tests.
Fix: sudo: command not found on Linux
How to fix 'sudo: command not found' on Linux — caused by sudo not installed, missing PATH in scripts, Docker containers without sudo, and su vs sudo confusion on minimal systems.
Fix: Nginx location Block Not Matching (Wrong Route Served)
How to fix Nginx location blocks not matching, caused by prefix vs regex priority, trailing slash issues, root vs alias confusion, and try_files misconfiguration.
Fix: Python SSL: CERTIFICATE_VERIFY_FAILED
How to fix Python SSL CERTIFICATE_VERIFY_FAILED error caused by missing root certificates on macOS, expired system certs, corporate proxies, and self-signed certificates in requests, urllib, and httpx.
Fix: React Context Not Updating / Re-rendering Components
How to fix React Context not triggering re-renders — caused by mutating state directly, wrong provider placement, stale closures, and missing value changes that React can detect.
Fix: No Routes Matched Location in React Router v6
How to fix 'No routes matched location' in React Router v6 — caused by missing Routes wrapper, wrong path syntax, nested route mismatches, and v5 to v6 migration issues.
Fix: VS Code Remote SSH Could Not Establish Connection
How to fix VS Code Remote SSH 'Could not establish connection' errors — caused by missing server files, SSH config issues, firewall blocks, and VS Code Server installation failures.
Fix: ASP.NET 500 Internal Server Error
Fix ASP.NET 500 Internal Server Error by enabling developer exception pages, fixing DI registration, connection strings, and middleware configuration.
Fix: Celery Task Not Received or Not Executing
Fix Celery tasks not being received or executed by resolving broker connections, autodiscovery issues, task name mismatches, and worker configuration.
Fix: Elasticsearch Cluster Health Red Status
Fix Elasticsearch cluster health red status by resolving unassigned shards, disk watermark issues, node failures, and shard allocation problems.