It seems the file wasn't properly created or saved in the correct location. Let's fix this issue by creating the file in the correct directory and ensuring it's properly integrated into the project.

Let's create the sardine-school component in the correct location and update the main page to use it:

These changes should resolve the issue of the missing file. The SardineSchool component is now correctly placed in the app/components directory, and the main page (app/page.tsx) imports and uses it properly.

To run this project:

1. Make sure all dependencies are installed by running npm install or yarn install.
2. Start the development server with npm run dev or yarn dev.

You should now see the sardine school simulation running in your browser. The sardines will swim randomly around the screen, and they will avoid the "shark" (your mouse cursor) when it gets too close.

If you encounter any other issues or need further modifications, please let me know.