---
title: Invalid Layout or Page Export
---

## Why This Error Occurred

Your [layout](/docs/app/api-reference/file-conventions/layout) or [page](/docs/app/api-reference/file-conventions/page) inside the app directory exports an invalid field. In these files, you're only allowed to export a default React component, or [Segment Configuration Options](/docs/app/api-reference/file-conventions/route-segment-config) for layout and pages, such as `revalidate`, `generateStaticParams`, etc.

Other custom exports are not allowed to catch misspelt configuration options and prevent conflicts with future options.

## Possible Ways to Fix It

You can create a new file and co-locate it with the page or layout. In the new file, you can export any custom fields and import it from anywhere.