Emitted 'error' event on WriteStream instance

What version of Next.js are you using?

12.0.2

What version of Node.js are you using?

v14.11.0

What browser are you using?

chrome

What operating system are you using?

windows

How are you deploying your application?

next run build

Describe the Bug

Hi,

When making a build for production, I keep getting this error. I never had the issue before upgrading to version 12.0.0. I tried deleting the file, but it only works when the dev server is not running, while it runs I cannot open or delete it and that make every production build fail.

info  - Creating an optimized production build .events.js:291
      throw er; // Unhandled 'error' event
      ^

Error: EPERM: operation not permitted, open 'D:\[...]\.next\trace'
Emitted 'error' event on WriteStream instance at:
    at D:\[...]\node_modules\next\dist\compiled\@vercel\nft\index.js:1:287421
    at D:\[...]\node_modules\next\dist\compiled\@vercel\nft\index.js:1:287860
    at FSReqCallback.oncomplete (fs.js:164:23) {
  errno: -4048,
  code: 'EPERM',
  syscall: 'open',
  path: 'D:\\[...]\\.next\\trace'
}

Expected Behavior

I expect it to work when building

To Reproduce

clone the with-typescript example, run npm run dev and once done npm run build

[maximegheraille]

I might have found the problem. I used the with-typescript example. When running npm run buid it works fine but when I have dev running via npm run dev and I build it, it gives that error. Before version 12.0.0 is always had the dev running while doing a production build (it was required for production build if I am not wrong).

[avdhootk]

you just need to stop the npm run dev and then run npm run build, that works for me