Turbopack Error: Next.js package not found

[Hossein-Khedmati]

Turbopack version: f9e98b9c

Error message:

Next.js package not found

Debug info:
- Execution of get_entrypoints_with_issues_operation failed
- Execution of EntrypointsOperation::new failed
- Execution of Project::entrypoints failed
- Execution of AppProject::routes failed
- Execution of directory_tree_to_entrypoints_internal failed
- Execution of directory_tree_to_loader_tree failed
- Execution of get_next_package failed
- Next.js package not found

[victormoni]

Hi @Hossein-Khedmati

This issue usually occurs when more than one lock file is detected.

You can check the reference here: #78192 (comment).

In addition, the latest Next.js canary releases now indicate how many lock files are present and specify which one will be used.

OR:

This error happens because the Next.js package is missing or not installed correctly.

How to fix it:

1. Install Next.js and React

npm install next react react-dom

or with Yarn:

yarn add next react react-dom

2. Check your package.json

Make sure it includes:

"dependencies": {
  "next": "14.x",
  "react": "18.x",
  "react-dom": "18.x"
}

3. Clear cache and reinstall

rm -rf node_modules .next package-lock.json
npm install

4. Run in the correct folder

Ensure you are in the project root where package.json is located.

5. Update Next.js if needed

npm install next@canary

In short: Reinstall Next.js in your project root and clear cache.