So the cause was a page.tsx in the root of (marketing) that I added on purpose to perform a redirect. Once removed this error disappears and the app could build.

At this time I do not understand why. But I suspect it has something to do with the dark science of routing.

Hi @garthboyd-devious-pl, welcome to the Vercel Community!

I'm glad you solved the issue.

Can you share the code that caused the error?

The code was a simple redirect in a page.tsx file residing in the apps/web/app directory.

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import { redirect } from 'next/navigation';
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export default function Page() {
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  redirect('/auth/sign-in');
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}

I moved the redirect to middleware and removed this file. Also of note was that the build error did not occur in my local dev environment.

Hi @garthboyd-devious-pl, thanks for sharing additional information. Can you also share your project directory structure? Because app/page.tsx and app/(marketing)/page.tsx would both resolve to / and cause an error. For more information, see https://nextjs.org/docs/app/building-your-application/routing/route-groups.

Hi Anshuman,

Thanks for following up on this.

I am using the Makerkit.dev framework if you are familiar with it. So the full path in the repo was:

/apps/web/app/page.tsx

Hope this helps. I am curious where you are going with this =)

Cheers, Garth

Hi @garthboyd-devious-pl, thanks for sharing additional information. I still think the issue was caused because app/page.tsx and app/(marketing)/page.tsx would both resolve to / and cause an error.