C2 Week-1 Assignment: All the exercises passes ,but final score is zero what's the soution

C2 Week-1 Assignment: All the exercises passes ,but final score is zero what’s the soution

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There can be a lot of different causes for this.

Please start your diagnosis by looking at the feedback from the grader. You’ll need to click on the > marker and then read the reason why the grader is unhappy.

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There is no error, but I wrote (There was a problem compiling the code from your notebook. Details:
name ‘N’ is not defined) and I do not understand what is meant

That means your notebook is using a variable named ‘N’ which is not defined by the test case the grader uses.

Dear @mayas,
Can you please share the screenshot?