Can’t get InstaDMG to use my 10.6 installer image.

I get this message when executing instadmg.bash: 11:53:27 ###### InstaDMG build initiated ###### InstaDMG version 1.6b2 (svn revision: 266) Host OS: Mac OS X 10.6 Host Hardware: iMac8,1 Output file name: 10-04-21.dmg Output disk name: InstaDMG 11:53:27 ###### Finding main MacOS X installer disk ###### ###### Unable to find primary installer disk ###### 11:53:27 ###### Cleaning up ###### Restoring normal installd daemon Ejecting images The "OSX 10.6.dmg" file I put in /InstallerFiles/BaseOS/ is a manually created image that worked in InstaDMG 1.5. The DMG file was manually renamed from "Mac OSX Installer Disk". Also, I yanked the InstaUp2Date subfolder from AddOns, since I don't want to use it (It's WAY easier to manage my 35 pkgs by dragging & dropping them vs. crafting a catalog file.) Any theory on why InstaDMG won't use the OS installer image?