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Fix 'npm package json not found' Error When Using npx - Troubleshooting Cloudflare Error 521 Post-Update-How to Activate Python Virtual Environment in Windows CMD

Updated 2026-07-28 06:19:04office-tools
Fix 'npm package json not found' Error When Using npx - Troubleshooting Cloudflare Error 521 Post-Update-How to Activate Python Virtual Environment in Windows CMD
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.

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