Fix npm run build Exit Code 1: Common Causes and Solutions - How to Fix Cloudflare Error 521: Server Not Responding-Chrome Extensions Not Working? Fixes for Loading Issues

Updated 2026-07-28 11:02:57backup-recovery

Fix npm run build Exit Code 1: Common Causes and Solutions - How to Fix Cloudflare Error 521: Server Not Responding-Chrome Extensions Not Working? Fixes for Loading Issues

Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

Restart the affected app after changing permissions or configuration files.
Test the same workflow in a clean browser profile or a temporary user account.
Compare the result on another network if the error may be connection related.