Unclear error message when deploying to Vercel

[lobsterkatie]

What version of Next.js are you using?

11.0.1

What version of Node.js are you using?

n/a

What browser are you using?

n/a

What operating system are you using?

linux (on vercel)

How are you deploying your application?

Vercel

Describe the Bug

See getsentry/sentry-javascript#3851.

When deploying their app to Vercel, one of our users is getting the error message:

Error! Builder returned invalid routes: should NOT be longer than 4096 characters

We're unable to replicate this behavior, and are having trouble debugging their issue, in part because the error message they're getting isn't totally clear. Specifically, what should not be longer than 4096 characters?

Expected Behavior

Ideally, the error message would:

a) Explain what value is too long (what it represents, where it was found, etc)
b) Perhaps even give the first n characters of said value, for easier pinpointing of the problem

To Reproduce

Do something which triggers this error message.

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For what it's worth, I've tried to find any version I could of this error in both the nextjs and vercel codebases, and have been unable to. The only similar issues/discussions I could find were vercel/vercel#5940 and vercel/vercel#4799, but neither one addressed this particular error message.

[lobsterkatie]

Thanks for the fast turnaround, @ijjk!

[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.