Unknown error in changing Rstudio appearance

  appearance, rstudio, windows

There is an unknown error when I try to change appearance of Rstudio. It appears when I click "Ok" or "Apply". The appearance will change after this error is passed, but the next time I open the Rstudio, the appearance will change back to default. Is there any way to find out what’s wrong? Thank you.
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Source: Windows Questions

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