BTW I am looking at the test code for that notebook and I literally do not see a way for you to get that exact error message. The one about “Got type <class list>, but expected type <class list>”. I suspect you are running with an old version of the files, not the latest.
If you’ve already passed the grader for this exercise, then it’s probably not a big deal. But you might want to follow the “Get Latest Version” procedure on the FAQ Thread and make sure to read the instructions all the way to the last couple of paragraphs where it tells you how to get the latest version of all the accompanying python files.