'Rstudio Rtools error?? 'Renviron contains invalid lines'

I use Rstudio.

I got an error while using Rstudio.
It's the same error as in the attached image.
I uninstalled Rtools, Rstudio and R and then reinstalled them all, but it doesn't change.
This error occurs at startup and the screen goes white and stops.
Do you know how to solve this problem?

devtools::find_rtools() is now True.
This error occurs whether Rtools is present in the path or not.
It also occurs in R-GUI.
R version 4.0.3

enter image description here

r


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