Hi, I followed the solution you gave but I cannot find the"./Renviron" folder, so I proceeded to do the rest. When I do the rest and follow the instructions, " *writeLines('PATH="C:\rtools40\usr\bin;${PATH}"', con = "~/.Renviron")" runs and after ristarting is just as if i did noting the mesage error is still there and Sys.which("make") just returns "". So I do not know what else to do. Ive tried everything.