All tests passed but got "NonType" error for each part

here is the error:
There was a problem compiling the code from your notebook. Details:
‘NoneType’ object has no attribute ‘shape’

Hi @QuercusVelutina ,

As there is no specific information about which lab assignment you are referring to, so this advice is general. When a NoneType error occurs, it could means that a function call has failed and returned none.