Fix Git 'index.lock file exists' Error
When you see the error fatal: Unable to create 'path/.git/index.lock': File exists....
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Git Clone Timed Out and Permission Denied Errors
When you run git clone and see errors like timed out or permissio...
Node.js Heap Out of Memory Troubleshooting Checklist
When a Node.js process crashes with FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - Ja...
Fix Angular Breakpoints Not Hit in VS Code
You set a breakpoint in an Angular component or service, start debugging in VS Code, and the brea...
How to Fix Git Unrelated Histories Error When Merging Branches
You try to merge two branches, and Git stops with: fatal: refusing to merge unrelated histo...
Fix Nginx 13 Permission Denied Error: Step-by-Step
You're configuring Nginx and see 13: Permission denied in the error log. This us...
Topic paths
Quick titles
Firefox SSL Error Only on WiFi: How to FixHow to Fix Git SSL Certificate Error on GitHubFix Chrome Certificate Error: Invalid Authority Registry on WindowsHow to Resolve Windows Update Cleanup Error 0x800f081fNode.js Memory Leak Troubleshooting GuideFix Cloudflare DNS Propagation DelaysGit Merge --allow-unrelated-histories vs Rebase GuideFix Firefox Secure Connection Failed Error Due to Antivirus