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---
title: Invalid webpack resolve alias
---
## Why This Error Occurred
When overriding `config.resolve.alias` incorrectly in `next.config.js` webpack will throw an error because private-next-pages is not defined.
## Possible Ways to Fix It
This is not a bug in Next.js, it's related to the user adding a custom webpack(config) config to next.config.js and overriding internals by not applying Next.js' aliases. Solution would be:
```js filename="next.config.js"
webpack(config) {
config.resolve.alias = {
...config.resolve.alias,
// your aliases
}
}
```
## Useful Links
- [Related issue](https://github.com/vercel/next.js/issues/6681)
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