The antlr plugin needs to be updated with the antlr jar (version 2.7.2).

Download antlr-2.7.2.zip from http://www.antlr.org/download.html

Note: you may have to find the zip file if the site has changed its file system. 
Start at http://www.antlr.org.

Extract the zip file contents antlr-2.7.2\antlr.jar to antlr\lib directory and rebuild.

