Can’t knit to PDF - line code error

I am new to RStudio. I am trying to knit a file to pdf and I keep getting this error (see pic). I can’t see what I am doing wrong. Grateful for any help.

The value to be plotted must be numeric, not letter grades

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Thank you, but my code worked as is, so that’s confusing to me.

Instead of a picture, it's much better to post your code along with at least a little bit of data. That way someone else can try running the code to see what happens.

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