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Home / backup-recovery / Cloudflare Error 521: Web Server Down Checklist - How to Remove Git index.lock in VS Code-Node Sass Build Error: How to Switch to Dart Sass

Cloudflare Error 521: Web Server Down Checklist - How to Remove Git index.lock in VS Code-Node Sass Build Error: How to Switch to Dart Sass

Updated 2026-07-28 11:10:23backup-recovery
Cloudflare Error 521: Web Server Down Checklist - How to Remove Git index.lock in VS Code-Node Sass Build Error: How to Switch to Dart Sass
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.

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