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The error says that you are dividing somewhere by zero, your code is probably not right implemented!
I don’t think your image shows the error message. It shows only that you failed one of the test cases.
Also I see your cell execution count is 154. That means it’s been a very long time since you reset the kernel and ran all the cells again. I recommend you do that, to help clean up any global variables that may have been modified in unexpected ways.