Next.js v15.3.3 Node.js v18.18.0 On Windows, and you're facing EMFILE / EPERM errors during build. this while creating build of next js project

[aatif007]

Summary

Build error occurred
[Error: EMFILE: too many open files, open 'E:\project.next\server\next-font-manifest.json'] {
errno: -4066,
syscall: 'open',
code: 'EMFILE',
path: 'E:\project\.next\server\next-font-manifest.json'
}

Additional information

No response

Example

No response

[icyJoseph]

Is this happening on a newly created project + next build?

[icyJoseph]

Aha, you are not using next/font?

Is this Pages Router too?

I am a bit of out ideas at the moment...

// next.config.js

module.exports = {
  experimental: {
     cpus: 1
  }
}

This should make the build way slower, assuming you have many cores, but then only one worker would be opening files. At least that's the assumption.

[aatif007]

yes i am not using the next/font.
yes it is a Pages Router too in my app.

module.exports = {
experimental: {
cpus: 1
}
}
i try with this but not working

[icyJoseph]

Same error? Mmm - maybe remove your node_modules and lock file, (package-lock.json), and re-run an install... this is really weird.

[aatif007]

yes Same error. i delete node modules and packages-lock many time but not working.

[icyJoseph]

I think, given the situation, we should try two things:

• create a new project, npx create-next-app@latest delete-after-test and make sure it builds
• in project with issues, create a new branch, and start to delete routes, eventually it has to build, then try re-adding some of the other routes, we are trying to figure out if a given route is causing this issue

[JELDOApp]

Application create projects application

[samranahm]

This error usually happens because the system is hitting the limit of open files. You can try increasing the file descriptor limit.