Trouble showing data from lesson 1

Hi, I’m new to this course and I was trying to run lesson1-pets and encountered this error

I tried changing env but it didn’t help
P.S: I use : Win 10 / python 3.7 (anaconda)/ nvidia gpu (980m) / fastai v1 ( I had previous version v0.7 and tried last years course and it went fine and showed no errors)

Your answer is in this thread.

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Thanks, I fixed the problem by adding num_workers=0 but I hope that it doesn’t affect training performance.