Error in C1_W3

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
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Hi, i am trying to submit my graded programming assignment. After submiting when grading this error comes:

Cell #20. Can’t compile the student’s code. Error: TypeError(“unsupported operand type(s) for +=: ‘NoneType’ and ‘NoneType’”)

Can anyone help

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Ps all tests were passed

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Have you renamed your notebook ipynb file?