Knowledge base for software setup, errors, and daily tool work.

Jupyter Kernel Dead: Common Causes and Fixes

You're working in a Jupyter notebook, and suddenly the kernel dies. The notebook becomes unrespon...

GitHub Actions Workflow Fails With No Error Message

You run a GitHub Actions workflow, it fails, but the log shows no error message—just a red X. Thi...

Fix Windows Security Token Expired Access Denied Errors

When a Windows security token expires, you may see an 'access denied' error even though you belie...

Fix 'ffmpeg command not found' in PHP exec()