I had the same problem while running Rstudio 0. I found after downloading and installing the dmg from SourceForge that the following commands worked for me.

I am a fairly novice at the command line and messing around with directories, so any help would be much appreciated. I am guessing there is some issue with rjags referencing an unknown file in the library, but I am not sure. Then I installed rjags in the R command line.