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next.js/errors/css-modules-npm.mdx
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---
title: CSS Modules Imported by a Dependency
---
## Why This Error Occurred
One of your dependencies (`node_modules`) imports a CSS Modules file.
This normally happens when a package's source files are accidentally consumed,
instead of the built package.
## Possible Ways to Fix It
Reach out to the maintainer and ask for them to publish a compiled version of
their dependency.
Compiled dependencies do not have references to CSS Module files, or any other
files that require bundler-specific integrations.
The dependency should also provide instructions about what CSS needs to be
imported by you, in your application.
If this is **first-party code**, try [including monorepo packages in the compilation pipeline](/docs/architecture/nextjs-compiler#module-transpilation).
> **Good to know**: This limitation does not exist when using the App Router.