Hi,
we need more information on what you are doing. It is highly possible this comes from your Rmd chunks content. Without it we won't be able to help.
I would really encourage you to review the following guide, FAQ: Tips for writing R-related questions. For example, the guide emphasizes asking coding questions with formatted code-chunks and a reprex, which would make it easier for people who want to help you to pick up your issue and attempt to run with a solution.
thanks