Fix npm run build Failed with PostCSS Error - How to Fix Git SSL Certificate Problem: Unable to Get Local Issuer-Windows Update Error 0x800f081f Troubleshooting Guide

Updated 2026-07-28 16:34:30backup-recovery
Fix npm run build Failed with PostCSS Error - How to Fix Git SSL Certificate Problem: Unable to Get Local Issuer-Windows Update Error 0x800f081f Troubleshooting Guide
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.