Unable to establish connection with R session Please Help

I installed Rstudio 1.3.1073 today and now getting error after installation. I tried the following methods:

  1. Re-installed Rstudio
  2. Tried with Rstudio 1.4.801, 1.3.1091
  3. Tried Run as administrator.
    but still, it is showing the same error. The error is showing when I am going to change my working directory. Even when I write a simple code "print(5+7)", it shows the error.
    Please Help!
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Try resetting Rstudio's state

Did you install R before RStudio? What version of R is installed?

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Yes. I installed R before RStudio. R version was 4.0.2