Internal Server Error

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

What URL were you getting that error from?

If that error messages shows up on your site, it's telling you that there is a bug in your code somewhere. The best way to track it down is to look at the website's error log -- there is a link to the log on the "Web" page inside PythonAnywhere, and the most recent error message will be at the bottom of the file.