Why does my code work on my computer but not others

I was told this GitHub code: https://github.com/aoljaca/jamming

does not work on someone’s computer, but it works on mine.

Why is this? Do I need to do something? It is a React App

When others say it does not work, what do they mean?

The person did not state the error. But do you get an error when you run the code?

Thanks!

I did not see any error when I ran the code, but I also did not get too far as I do not have a facebook account or spotify account to be able to use the app. I personally think the app should work without having to have an account. Otherwise, I would rather just use Spotify.