Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're seeing a 522 error from Cloudflare. That means Cloudflare connected to your origin ser...

You run npm install and see an error like Node Sass does not yet support your ...

Fix npm run build: Module Not Found Error
When you run npm run build and see a Module not found error, the bu...

Fix Python Permission Denied When Installing Packages on Windows
You run pip install somepackage on Windows and get a PermissionError

Fix Node.js Out of Memory When Building React Apps
When building a React app, you might see a fatal error like FATAL ERROR: Ineffective mark-c...

How to Fix Git Index Lock File Exists Error
If you see an error like fatal: Unable to create 'path/to/repo/.git/index.lock': Fi...