---
title: Nested Reserved Page
---

## Why This Error Occurred

In your pages folder you nested a reserved page e.g. `_app`, `_error`, or `_document` which causes the page to not be used since they must be located directly under the pages folder.

## Possible Ways to Fix It

Move the reserved pages directly under your pages folder so that they are picked up and used correctly.

## Useful Links

- [Custom `_app` Documentation](/docs/pages/building-your-application/routing/custom-app)
- [Custom `_error` Documentation](/docs/pages/building-your-application/routing/custom-error)
- [Custom `_document` Documentation](/docs/pages/building-your-application/routing/custom-document)