Fastbook Chapter 2, Runtime Error

Hi, i am having a similar issue to this post: Dataloaders error on learn.fine_tune(1). However, my issue arises after the fine_tune, on the ClassificationInterpretation step. I tried the num_workers fix which allowed me to fine_tune, however i get the same error on the next step, as depicted here:

The odd thing is that it worked yesterday while stepping through it. Today, it no longer works.
I am running it locally on a windows machine, but as stated, it worked yesterday. Does anyone have any suggestions as to why im suddenly getting this error on this step?