C4W3 Question Answering Assignment - Grader Error: Grader feedback not found


I am getting “Grader Error: Grader feedback not found” when I submit. All my test cases are passing.

Yesterday night I solved “Tokenize and mask” and “parse_squad” exercises (I used # grade-up-to-here option) and submitted. I got 70/100 [please see first screenshot]. Today I solved “answer_question” exercise. Now after submitting I am getting error “Grader Error: Grader feedback not found” even for the two exercises I solved yesterday. [please see second screenshot]. I have checked function parameters as well as deleted # grade-up-to-here. Please let me know how to resolve this error.

Thank you,

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This is a known technical issue with Coursera.
The course staff has been notified.

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Thank you

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