Error when trying to plot a boxplot

Hello, I am trying to plot a boxplot, but once I ran the code, it gave me an error and I'm not sure how to fix this. Please help me.
Screen Shot 2020-10-26 at 12.58.40 AM|690x360

Hi @trl.la! Please copy and paste your code into your post along with some data, so we can first reproduce your problem.

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