You’re probably calling the JS files in the wrong folder, or you have them misplaced.
At the end of your code, you’re calling all the JS files like this:
However, those files can not be found:
etc. etc, they all give 404 errors.
I checked in the root folder, but they’re also not there:
So basically, just make sure you have placed all the JS files in the right location, and then call them using the proper path.