Week #2: I got "Grader feedback not found" Error in C2_W2_Assignment in "Calculus for Machine Learning and Data Science"

I have a problem in this assignment, when I submit I got that error “Grader feedback not found”
I’m checked everything, I didn’t use any global vars, so I’m sure everything is ok
how can i solve it?


The grader is broken at this time.
Coursera has been notified.
Hopefully they will fix it soon.

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