W2C4 submission failed

Failed test case: parse_data_from_input has incorrect type.
but got:
<class 'NoneType'>

And It gives same error for train_val_generators and create_model functions.
But I already completed all required functions. Outputs of my functions matched with expected outputs.
My training acc: 0.9333, and val_acc : 0.9767. I don’t know why this error appears.

Please check notebook metadata and refresh the workspace if required / in doubt. If that doesn’t help, please click my name and message your notebook as an attachment.

My notebook is corrupted. Now it works. Thanks