Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You run docker compose up and get an error like Error: Port 3306 is already al...

Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Fix VS Code Permission Denied Error Code 13
You open a file or run a task in VS Code and see Error: EACCES: permission denied, open ...

Resolve Python Package Version Mismatch Errors
You run pip install and see errors like “package A requires package B==1.0 but y...

Fixing Python Memory Errors on Large Files in Linux
When processing a large file in Python on Linux, you may encounter a MemoryError or ...

Fix Windows Explorer Restarting with SFC Scannow
If Windows Explorer keeps restarting on its own—your taskbar disappears and reappears, or File Ex...