Help with Unfinished Business inre: Siege of Dragonspear on Mac

Howdy,
After sticking with an older version of BG:EE (OS X) for the past year or so, I finally buckled under and bought Siege of Dragonspear, thus forcing the update. Had to reinstall mods, no big deal and I don't really use that many. One of them is Unfinished Business and, unfortunately, I can't get the mod to execute properly. This is what I get when I click the command:



I've done the modmerge thing, and the other couple few seem to work. Best I can tell, I'm trying to use the most recent version of Unfinished Business for Mac. Thanks in advance.