DLSC1 Week 2 programming assign. error

Hmmm, that looks like some kind of internal error with the grader. FWIW I just tried submitting my version of that notebook and it worked fine for me, so there is not some kind of “server side” problem in general. I’m wondering if maybe there is something damaged about your notebook. The other thing to try would be to get a fresh copy using the procedure on the FAQ Thread and then carefully “copy/paste” over just your completed work and then try again.