'list' object has no attribute 'shape' - zombie detector

I can’t get the gradient tape to work in exercise 10. I’ve tried many iterations. Nearly everything I try tends to have this error.
How do I figure out how to preprocess the images correctly?

Oy. For lack of noticing a plural word, I spent over an hour. Got it now.
[model.preprocess(my_problem)[0]

So your issue is resolved, right?

Yes. Thanks.