Latticist on Mac OSX

Question

I'm trying to run Latticist on Rattle, however, I keep getting the following messages:

The following object(s) are masked from package:latticeExtra :

    rootogram 

Attaching package: 'latticist'

The following object(s) are masked from package:latticeExtra :

    custom.theme.2 

How can I unmask these objects? As I said in the title, I am running on a Mac which may be the source of the issue.