Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

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

If you see a FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of me...

Python Virtual Environment Not Activating in Git Bash: Fixes
You're in Git Bash on Windows, you run source venv/Scripts/activate, and nothing...

Fix Windows Update Error 0x80070002
Windows Update error 0x80070002 usually appears during an update attempt. The system may stall at...

Fix Chrome Access Violation Error When Opening PDFs
You click a PDF link in Chrome and instead of the document, you see an error: Access Violatio...

Fix npm install Permission Denied on Shared Hosting
When you run npm install on a shared hosting server, you might see errors like