WK4 assignment: unindent error

I have not taken that specialization, so I don’t know if I will be able to help. But I can try to take a look. Maybe before we go to that step, a more productive next step would be to try getting a clean copy of the notebook and then carefully “copy/pasting” over just your completed code segments from the existing notebook. There is a topic on the DLS FAQ Thread that explains how to get a clean copy.

My theory there is that you have accidentally damaged some of the “template” code …