error"Unable to establish connection with R session"

Every time I open Rstudio, a message appears constantly
"Unable to establish connection with R session"
what can i do?

The first things to rule out:

Some system Information could be useful as well

#### System Information:
- RStudio Edition: (Desktop or Server)
- RStudio Version: 
- OS Version: 
- R Version: 

#### Also:
<!-- Depending on your issue, the following may be useful /-->
<!-- If a section isn't relevant or you can't collect it just delete that section below /-->
- RStudio diagnostics report: <!--see /-->
- Your `sessionInfo()`:
- RStudio crash report: <!-- /-->
- RStudio application log files: <!-- /-->

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