TF1 C3W1 name 'stopwords' is not defined

I was working on the W1 assignment of the C3 TF course and it keeps telling me that the stopwords are not defined while my results and the expected values are the same, and also the stopwords have been predefined on the notebook. Can someone help?

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Please refresh your workspace and try again.
If you’ve already done this, click my name and message your notebook as an attachment.

Based on your notebook, the bug is in def tokenize_labels. When tested in isolation, access to sentences is invalid. You should transform the labels.

I had to update and refresh and rewrite the code and it worked!

Thank you so much for your help