Can someone explain what I did wrong to get this error? "ERROR in main Module not found: Error: Can't resolve "

I have been following a django-react tutorial and ran into a problem with the command npm run dev. I thought it was a problem with the webpack file but maybe not.

This is the error that I am receiving: [error message][1]

[webpack file][2]
[package.json][3]
[file structure and app.js][4]

Sorry if anything about my problem is unclear this is my first post so let me know if I can clarify anything. Any help would be greatly appreciated.

[1]: https://i.stack.imgur.com/vCK8g.png
[2]: https://i.stack.imgur.com/eqYai.png
[3]: https://i.stack.imgur.com/Yea1b.png
[4]: https://i.stack.imgur.com/dLBXd.png