Can someone help in understanding these problems - C1W3

Course Q&A TensorFlow Developer Professional Introduction to TF for Artificial Intelligence ...
1

  1. Failed test case: reshape_and_normalize has incorrect type.
    Expected:
    typing.Callable,
    but got:
    <class ‘NoneType’>.

  2. There was a problem grading your submission. Details:
    issubclass() arg 1 must be a class

3.Failed test case: history has incorrect type.
Expected:
<class ‘keras.callbacks.History’>,
but got:
<class ‘NoneType’>.

2

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3

Thank you so much, it worked !!