C2W1 - Assigment Grading not working?

Hi,

I​’m getting :
Modifying the domain:
All tests passed! Congratulations!

a​nd then directly after it:
M​odifying the domain:
Failed test case: modify_domain_of_features has incorrect type. Expected: typing.Callable, but got: <class ‘NoneType’>.

I resubmitted 10 times, and keep getting it even after changing some small things. Any help?

my notebook id is heajjtfm

found the answer here I think Grader for C2W1 is broken for me - #2 by chris.favila

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