When starting up RStudio on OS X, you may see an error similar to the following:
ERROR: r error 4 (R code execution error) [errormsg=Error in identical(call[[1L]]; quote(doTryCatch)) : 7 arguments passed to .Internal(identical) which requires 5 , code=local ....
Typically when we see this problem, it’s caused by a conflict between multiple versions of R installed on your computer. We recommend in this case navigating to the folder
/Library/Frameworks/R.framework/Versions/ and removing any versions of R that you don’t wish to use (you can move them to another folder if you think you might want to use them later).