I try to install rtools after installing my R studio. After installing R tools (R-4 alpha), I installed devtools.
I try to load("devtools"), but "usethis" was necessary.
After installing "usethis 1.5.1", when I try to load it I have received this error message:
Error: package or namespace load failed for ‘usethis’ in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]):
there is no package called ‘fs’
Warning: unable to access index for repository https://cran.rstudio.com/src/contrib:
cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
Any help will be appreciated