Got this error when knit to pdf?

Hi, anyone can help me with the following asap, please.

When I run the knit to pdf I got the following error.

Error in labs (title= label, subtitle = subtitle : argument "label" is missing, with no default Calls: ... withVisible -> eval -> eval -> ggtitle -> labs -> dots_list In addition: warning message: in PATH: pdfcrop, ghostcript -> As result, figure cropping will be disabled.

You might want to post the part of the code that includes the labs() function.

I was able to sort it out by myself, It's my bad I missed to code ggplot title and left the code blank. Anyway thank you for your help.

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