Warning in system(full, intern = TRUE, ignore.stderr = quiet) :
  running command ''/usr/bin/git' ls-remote https://github.com/does/not/exist/404.git  2>/dev/null' had status 128
Warning in system(full, intern = TRUE, ignore.stderr = quiet) :
  running command ''/usr/bin/git' ls-remote https://github.com/does/not/exist/404.git  2>/dev/null' had status 128
Error: Failed to install 'unknown package' from Git:
  Command failed (128)
In addition: Warning message:
In .rk.do.call("doPlugin", callstrings) :
  Not all specified settings could be applied. Most likely this is because some R objects are no longer present in your current workspace.
