# “Module not found” after pulling changes

**What you see:** After a pull or switching branch, the app fails with `Module not found` or `Cannot find module`.

**Why it happens:** The project now uses a package that isn't installed on your computer yet.

## How to fix it

1. Ask your agent to run `npm install`.
2. Start the app again.

## Message for your agent

```text
I get “Module not found”. Run npm install, restart the app and tell me which package was missing and why we need it.
```

**How to prevent it:** After every pull, your agent installs dependencies if they changed.

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Source: [Agentic Makers](https://agenticmakers.app/en/help/module-not-found) · License: CC BY 4.0