---
title: Could not find a production build
url: "https://nextjs.org/docs/messages/production-start-no-build-id"
---



## Why This Error Occurred

When running `next start` or a custom server in production mode a production build is needed.

## Possible Ways to Fix It

- Run `next build` to create a production build before booting up the production server.
- If your intention was to run the development server run `next dev` instead.