In socketConnection("localhost", port = port, server = TRUE, blocking = TRUE, : port 11941 cannot be opened

RStudio IDE
,
1

Mac: Catalina 10.15.5 version
R version : 4.0.1

After updating, I am not able to install rstan/brms.
I'm getting the following error:

Error in socketConnection("localhost", port = port, server = TRUE, blocking = TRUE, :
cannot open the connection
In addition: Warning message:
In socketConnection("localhost", port = port, server = TRUE, blocking = TRUE, :
port 11941 cannot be opened
Warning: namespace ‘Rcpp’ is not available and has been replaced
by .GlobalEnv when processing object ‘.__C__Rcpp_stan_fit4model1266e6d4bb425_de26c29024b63e29480774ee47151b1c’

2

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