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Fix npm run build Failed with PostCSS Error - How to Fix Git 'index.lock' File Exists Error-Troubleshooting Nginx 502: Backend Connection Refused

Updated 2026-07-28 12:59:12windows-fixes
Fix npm run build Failed with PostCSS Error - How to Fix Git 'index.lock' File Exists Error-Troubleshooting Nginx 502: Backend Connection Refused
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