Lesson 2 empty generator

Hello, has anyone gotten an error saying: /usr/local/lib/python3.6/dist-packages/fastprogress/fastprogress.py:105: UserWarning: Your generator is empty.
warn(“Your generator is empty.”)

This error appears after I type in:
for c in classes:
verify_images(path/c, delete=True, max_size=500)

I’ve ran the notebooks many different ways but I keep on getting this same error.

I’m very new to deep learning, so getting the setup right has been a struggle. I haven’t been able to even start training a model because I keep running into problems. I’m using google colab by the way. Someone please help.

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What is the output of print(classes).