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---
title: 'Experimental `appDir: true`'
---
## Why This Error Occurred
Your project contains a directory named `app/`. Since Next.js 13, this is a [reserved name](/blog/next-13#new-app-directory-beta).
## Possible Ways to Fix It
To use the new app directory and its features, please add `appDir: true` to your configuration in `next.config.js` under `experimental`.
```js filename="next.config.js"
/** @type {import('next').NextConfig} */
const nextConfig = {
experimental: {
appDir: true,
},
}
module.exports = nextConfig
```
If you do not want to use the new `app/` directory features yet, but have a directory named `app/`, rename the directory to something else.
## Useful Links
- [Next.js 13 App directory](/blog/next-13#new-app-directory-beta)
- [App directory documentation](/docs/app/getting-started)
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