Assignment of car detection with YOLO algorithm:
The automatic grader outputs “Comment line with index: UNQ_C2 wasn’t found in code” with grade 0/100 despite the fact that I passed all the tests before I submitted.
Can you help me to figure out what the problem is please?

The problem is that you deleted the comment line in one of the code cells that provided the grader’s ID number for the assignment.

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How do I open a new notebook for this assignment?

Try item B.5 in the FAQ: