I was trying out the usethis package and made a mistake and it has been quite unforgiving.
This error message starts up with R no matter what version or after new session
Error in usethis::usethis.protocol = "https" : object 'usethis' not found
I am able to run scripts but not Shiny Applications/knit markdown documents.
This error shows up in other versions of R ie versions 3.5.
I reinstalled usethis
I have tried re-starting/new sessions of R
I have uninstalled and reinstalled R 3.6 including libraries
I have uninstalled previous version of R
I have uninstalled and reinstalled R studio
Sorry not able to run a reprex on it either.
R version 3.6.0 (2019-04-26)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 17134)