Unable to install SDSFoundation package after unzipping.
Following Message appears
"> install.packages("C:/Users/Desktop/SDSFoundations 1.3/R/SDSFoundations", repos = NULL)
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
Installing package into ‘C:/Users/skottarath/Documents/R/win-library/4.1’
(as ‘lib’ is unspecified)
Error in install.packages : type == "both" cannot be used with 'repos = NULL'
Making 'packages.html' ... done"