Turbopack Error: Failed to write app endpoint /page

[daihochungvuong]

Turbopack version: bf45b786
Next.js version: 0.0.0

Error message:

Turbopack Error: Failed to write app endpoint /page

[praveen-kumary]

This usually happens when Turbopack fails to emit the compiled page bundle into .next due to a locked file, stale cache, or missing default export.

Quick fix:

1. Stop the dev server.
2. Clear the build cache:

   rm -rf .next

   (on Windows PowerShell: Remove-Item -Recurse -Force .next)
3. Check app/page.tsx (or pages/index.tsx) to ensure it has a valid export default function Page() { ... }.
4. Restart with npm run dev.

(If you're running from source or canary 0.0.0, run a fresh pnpm install first.)