Grade error: Sorry, your submission was incorrect. Please try again. ‘'white_df' is not defined & 'red_df'

Hello everyone.
Let’s have a check at the grader output:
1

2

Capture d’écran 2022-06-19 140634

4

5

Take a look at the outcomes I obtained.

Have you encountered this? I am confused. I am sure that I did the right thing, and the results were identical without any error.
Any thoughts?

Did you search in the forum, it seems to me your problem might be similar to this post Post

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Sir, please accept my greetings.
Thank you for your help.

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