Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You open Chrome and see NET::ERR_CERT_AUTHORITY_INVALID on every site, even trus...

You're running a Node.js application and it crashes with FATAL ERROR: CALL_AND_RETRY_LA...

Fix Windows Defender Real-Time Protection Not Running
You open Windows Security and see a yellow warning: "Real-time protection is off." Or you...

Fixing node-sass Build Failures on macOS
You run npm install and hit a wall: node-sass fails to compile native modules on mac...

Fix Firefox Secure Connection Failed on Windows 10
You're browsing in Firefox on Windows 10 and get a full-page error: Secure Connection Fai...

Python Virtual Environment Not Activating on Mac: Fixes
You open Terminal, run source venv/bin/activate, and nothing happens—or you get an e...