HELP!! Unable to establish connection with R session

Hello -

I've been getting this error for the past 3 months running R. I've tried digging around in forums to find the answer to this and nothing has really worked.

I keep getting the Error: Unable to establish connection with R session when I am trying to run basically anything in R. It doesn't matter what script I use, whether I have packages from my library loaded or not I still get this error.

I am using Rstudio version Version 1.2.1335 and R version 3.6.3

I reset the Rstudio state by deleting the temporary folder following the directions here: and then I reopened Rstudio and tried simply running 2+2 and I still got the error

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