Problem: Git was installed, and after update of MacOS, Rstudio no longer can locate git binary executable. When in Rstudio, the git tab is missing.

Testing:

1. run git from command line — should not throw error.
2. run —–> which git

Solution: Make sure you have latest version of xcode installed.

xcode-select –install

Reference: https://apple.stackexchange.com/questions/254380/macos-sierra-invalid-active-developer-path