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

Fix Python Permission Denied When Installing Package in Virtual Environment

You activate your Python virtual environment, run pip install somepackage, and get a...

Fix ENOENT Error: package.json Not Found in React App

When running npm start or npm install in a React app, you may see an er...

Fix Node Sass Build Failure After npm Cache Clean

Nginx Upstream Connection Refused: Diagnosis and Fixes

When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...

Fix ERR_CERT_AUTHORITY_INVALID on Localhost

When testing a local web app, you may see ERR_CERT_AUTHORITY_INVALID in Chrome or si...

Fixing NGINX 502 Bad Gateway in Docker Containers

When running NGINX as a reverse proxy in Docker, a 502 Bad Gateway error usually means NGINX cann...