
Git Push Rejected Non Fast Forward: Troubleshooting Checklist
If you see ! [rejected] main -> main (non-fast-forward) when running

If you see ! [rejected] main -> main (non-fast-forward) when running

When you see fatal: Unable to create 'path/.git/index.lock': File exists., G...

You've created a Python virtual environment, but when you try to activate it, nothing happens...

If you see fatal: Unable to create 'path/.git/index.lock': File exists. when...

You're trying to push a commit that includes a large file—maybe a dataset, a binary, or a gen...

You run npm run build and get a wall of TypeScript errors. The build fails, and you&...