As I mentioned previously, some scripts from this site when downloaded to OS X 10.8 may not pass Gatekeeper Security when set to the "Mac App Store or Developer ID" setting (the default Gatekeeper setting). To over-ride Gatekeeper settings, Control-click/Right-click the script in the Finder and choose Open from the contextual menu, then allow the script to be opened.
However, for a small number of scripts, even this may not work. You may see an OSStatus error message and the script will still be unable to run.
It appears to occur with a few .app scripts, but not all.
I'll try to catch these scripts (and if you run into one, let me know) and update them. In the meantime, the fix is to temporarily lower your Gatekeeper Security settings to allow apps from anywhere to launch. Once the script is launched, you can restore your Gatekeeper settings.
PITA, I know.