Error message

I updated R to R.4.1.0 on another desktop and attempted to run my code again with the following error message:
Error in cleanup_makevar(old) :
argument “RMU” is missing, with no default
In addition: Warning message:
In system(paste(CXX, ARGS), ignore.stdout = TRUE, ignore.stderr = TRUE) :
‘C:/Rtools/mingw_/bin/g++’ not found

In canvasing the forum I came across others that reported similar error messages but did not see a solution posted.

Hey there!

Did you install Rtools?