Error in switch_lang

In RStudio server on KAC

If you’ve upgraded R packages to the newest version, you may experience that you no longer can run scripts, and you may be shown this error note:

Error in switch_lang(...)

In that case, you have to go back to a earlier version of packages i.e. the package ‘rlang’ has to be downgraded:

rlang_0.4.0 > rlang_0.2.2


  • Click the “Packages” tab
  • Write rlang in the search bar to the right. This should make multiple versions appear.
  • Hit the little (x), that is right next to the latest version to uninstall it.
  • Now you can run your code and it should work from here. Otherwise, try to start a new connection.