C1_W1- There was a problem grading your submission

Ah, good point. It seems a bit counterintuitive: you’d think that clicking “Submit” in whatever notebook you happen to be working on would grade that notebook, but that’s not the way it works. Definitely a violation of the PLA (Principle of Least Astonishment). :nerd_face:

FWIW this is mentioned in the DLS FAQ Thread. A lot of the information there is generic to all the courses.

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