Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When installing Python packages with pip, you might see an error ending with exit code 1

Fix Git LFS Authentication Failed on Push
You try to push a repository with Git LFS objects and get an error like Authentication fail...

Fix Node.js Heap Out of Memory When Running Tests
When running test suites, you may encounter a fatal error like FATAL ERROR: Ineffective mar...

Why npm Says 'package.json Not Found' and How to Fix It
You run npm install or npm start and get npm ERR! package.json no...

Fix Nginx Upstream Connection Refused Behind Cloudflare
If you see upstream connection refused in your Nginx error logs while using Cloudfla...

Fixing Nginx Permission Denied for Root Directory
You've set up a new Nginx server block, pointed the root directive to a directory, and when y...