Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You try to install a Python package with pip, and get an error like error: externally-manag...

Fix npm 'package.json not found' Error in Subdirectories
You're working in a subdirectory of your project, run npm install or npm r...

Fix 'npm install' Permission Denied When Using Yarn
You run yarn install in a project and later try npm install only to hit...

Fix 'python command not found' After Windows Upgrade
After upgrading Windows 10 to 11 (or a major feature update), many users find that typing p...

Cloudflare 522 Error: Server Response Time Troubleshooting
You're browsing a site and get a Cloudflare 522 error—'Connection timed out' or '...

Fix Nginx Upstream Connection Refused in Docker
You have Nginx running, either on the host or in a container, proxying to another Docker containe...