Transfer learning week 2,course 4 grades 0/100

My guess is that you have accidentally damaged some part of the notebook that the grader depends on. The next thing to try is to follow the “get a clean copy” procedure from the FAQ Thread and then very carefully “copy/paste” over just your completed code from the “YOUR CODE HERE” sections to the clean notebook. Please let us know if that fixes the problem or not.

I guess it is also possible that this was some kind of transient server error. Before you try the “get a clean copy” procedure, you could try doing this sequence and see if it helps:

Kernel -> Restart and Clear Output
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You can submit as many times as you like and there is no penalty. The system is smart enough to remember your best score.