Server functions not working on Vercel on V. 12

[CruelMoney]

What version of Next.js are you using?

12.0.1

What version of Node.js are you using?

14 with yarn workspaces

What browser are you using?

Firefox

What operating system are you using?

macOS

How are you deploying your application?

Vercel

Describe the Bug

After upgrading to v. 12.0.1 from 11, I'm seeing the following error on server-rendered pages or API endpoints:

2021-10-29T06:41:38.719Z	1b7c44bd-4566-4e9b-9bb6-4815b987e8ed	
ERROR	Error: Cannot find module '/var/task/node_modules/next/dist/server/next.js'. Please verify that the package.json has a valid "main" entry
    at tryPackage (internal/modules/cjs/loader.js:320:19)
    at Function.Module._findPath (internal/modules/cjs/loader.js:533:18)
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:875:27)
    at Function.Module._load (internal/modules/cjs/loader.js:745:27)
    at Module.require (internal/modules/cjs/loader.js:961:19)
    at require (internal/modules/cjs/helpers.js:92:18)
    at Object.<anonymous> (/var/task/node_modules/@sentry/nextjs/dist/utils/instrumentServer.js:7:14)
    at Module._compile (internal/modules/cjs/loader.js:1072:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1101:10)
    at Module.load (internal/modules/cjs/loader.js:937:32) {  code: 'MODULE_NOT_FOUND',  path: '/var/task/node_modules/next/package.json',  requestPath: 'next'}

It seems to be on all pages that use server functions - so static pages work.

Expected Behavior

To have all pages render without errors.

To Reproduce

Upgrade project from 11.1.3 to 12.0.1. Deploy to Vercel and attempt to load a page that uses getServerSideProps.

The project works when building and running it locally.

[CruelMoney]

Sorry, I see this might be related to the Sentry module. Will try to remove sentry and see if it works.

[CruelMoney]

Ok, my bad.. removing withSentryConfig from next.config.js fixed the issue. Closing now.

[AkashRajpurohit]

Hi @CruelMoney I am also using Sentry and facing this issue. How is removing withSentryConfig fixing this?
Is there any new method of adding your sentry config post Nextjs v12?

[ovidb]

@CruelMoney @AkashRajpurohit Have you find a workaround to using sentry with Next 12?

[brentkirkland]

@ovidb add outputFileTracing: false to your next config

[AkashRajpurohit]

The comment mentioned by @brentkirkland fixed for me as well @ovidb

[dcastil]

Linking to getsentry/sentry-javascript#4103 in case anyone searches for a canonical issue.

[ivolivares]

4:30am 🕟

Thank you all for this thread, works for me too!!

[aalises]

Thanks! disabling outputFileTracing also fixed the issue for me.

[curiousercreative]

Just to say the upstream bug has been fixed and you all should consider updating sentry packages and reverting this workaround.

[balazsorban44]

This issue has been automatically locked due to no recent activity. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.