Turbopack Error: failed to write to D:\Downloads\nextjs\resonance\.next\dev\server\chunks\ssr\[externals]_node:buffer_00e2e67a._.js

[bonannogiovanni]

Turbopack version: 23c46498
Next.js version: 0.0.0

Error message:

failed to write to D:\Downloads\nextjs\resonance\.next\dev\server\chunks\ssr\[externals]_node:buffer_00e2e67a._.js

Caused by:
- The filename, directory name, or volume label syntax is incorrect. (os error 123)

[asaddevx]

Hey @bonannogiovanni , this is a Windows path issue, not a Turbopack bug.

OS error 123 means Windows can't handle the filename syntax , specifically the square brackets [externals] in the generated chunk path, which Windows treats as invalid in certain contexts.

Fix, move your project out of Downloads and into a simpler path:

C:\Projects\resonance

or

C:\Users\YourName\resonance

Windows can be picky with deeply nested paths + special characters in Downloads or OneDrive-synced folders. A clean short path at the root level usually resolves it instantly.

If moving the project doesn't help, also try:

• Disabling OneDrive sync on your project folder
• Running your terminal as Administrator
• Clearing .next folder and restarting dev server

---

Short and accurate — the bracket characters in Turbopack's generated filenames trip up Windows path handling, moving the project is the real fix.

[bonannogiovanni]

You were right, I changed it to c:\Users\username\Projects\nextjs\resonance\ and now it works, so apparently, using a usb pen to store a nextjs project is a bad idea, weird...thanks anyway