Turbopack Error: Permission denied (os error 13)

[codetechie-G]

Turbopack version: ff756b2c
Next.js version: 0.0.0

Error message:

Permission denied (os error 13)

Debug info:
- Execution of TaskId { id: 2147483648 } transient failed
- Permission denied (os error 13)

[haroonmaqbool]

Hi @codetechie-G , this error usually means the Turbopack process doesn’t have permission to read or write to one of the build folders (often .next, .turbo, or the project directory). Try running your dev command with proper access or clearing the cache folders first:
rm -rf .next .turbo && npm run dev
If you’re on Windows make sure your shell has admin rights or that your project isn’t in a protected directory like Program Files.

[codetechie-G]

I am using ubuntu.

dev@dev-virtual-machine:~/Documents/nomiss-admin$ rm -rf .next .turbo && npm run dev

[email protected] dev
next dev --turbopack

▲ Next.js 15.5.0 (Turbopack)

• Local: http://localhost:3000
• Network: http://192.168.111.129:3000
• Environments: .env.local

✓ Starting...

---

FATAL: An unexpected Turbopack error occurred. A panic log has been written to /tmp/next-panic-4eb74cad627bab61c15b4b578468ef9c.log.

To help make Turbopack better, report this error by clicking here.

Error [TurbopackInternalError]: Permission denied (os error 13)

Debug info:

• Execution of TaskId { id: 2147483648 } transient failed
• Permission denied (os error 13)
  at (TurbopackInternalError: Permission denied (os error 13)) {
  location: undefined
  }

Like the above error is happening.

[icyJoseph]

Is this using WSL?

[haroonmaqbool]

Since you’re on Ubuntu this usually happens when Turbopack doesn’t have permission to write to /tmp or your project directory. Try running: sudo chown -R $USER:$USER /tmp .next .turbo
Then start your dev server again. If the issue still persists check if /tmp is mounted with noexec or restricted permissions. Turbopack writes temporary build files there so it needs full access.

[icyJoseph]

Can you cat this file? /tmp/next-panic-4eb74cad627bab61c15b4b578468ef9c.log - filter out anything you might consider sensitive

[icyJoseph]

Also what Next.js version? The printout shows, Next.js version: 0.0.0

[codetechie-G]

I can't see tmp folder after run server.
Nextjs version is 15.5.0

[icyJoseph]

Do you mind trying 15.5.5?

The /tmp folder is from the root of your OS, you can do cat /tmp/next-panic....etc.log - it'd be weird if the panic log writing was the error we are seeing, meaning that the root issue is shadowed 😓 😅

[codetechie-G]

Is this using WSL?
Not used.

[icyJoseph]

I'd be careful running operations under sudo as the other answers are suggesting.

Is this happening with a fresh create-next-app?

[codetechie-G]

GNU nano 6.2 /tmp/next-panic-3a868e986ee11a27825def19c9e7fca3.log

Permission denied (os error 13)

Debug info:

• Execution of TaskId { id: 2147483648 } transient failed
• Permission denied (os error 13)

[DanielSalazarLoaiza]

This error usually occurs when Turbopack lacks permission to read or write files in your project directory.
On Windows or Linux, ensure the .next folder and your workspace are writable, and try running your terminal as administrator (or using sudo).

Deleting .next and rebuilding the project often resolves it. If the issue persists, check for antivirus or file lock interference on build files.