RuntimeError: Lesson 3 - Quick Dogs vs Cats

Hi,
At the beginning of Lesson 3 there is Quick Dogs vs Cats [end to end process] classification code
The first two sections of the code run successfully

But when running the third section (unfreezing) i’m getting the following error message

It is not clear to me how to interpret the error message, and what is wrong with running
I would appreciate your help
Thanks
Moran