I can't move my character when starting my game, "Unhandled promise rejection" error

I made this game last year around the end of September. It worked fine then, but there’s been a lot of updates since then that probably broke things.

When I start the game, I can’t move my character at all, and a lot of errors pop up in the editor. There’s an error message above the left column that says, “Unable to generate auto collider for this asset,” but I don’t know which asset it’s talking about. There are also a lot of errors in the console:

Where can I look to figure out where the errors are? I assumed the problem was in the character controller since I can’t move, but I didn’t notice any red errors in there. I’m using the character controller we learned how to make in this tutorial from 8th Wall on YouTube. There’s a Google drive link in the description with the file for the code.