Hello @mrgransky ,
Some people faced the same problem but in a different week of the course, the problem is usually in the first function because the following functions depend on it.
Check this thread, and if you don’t find any helpful information, click my name and send me your .ipynb file in a private message and I’ll see what’s wrong.
Expected: typing.Callable, but got: <class ‘NoneType’> - TF1 Course 2 / TF1 Course 2 Week 4 - DeepLearning.AI