Unable to Find OS Installer Disc

Rev 452 MacOS X Client 10.7 11A511.dmg is contained ./InstaDMG/InstallerFiles/InstallerDiscs/ This DMG was built off of the installESD.dmg from the App Store via the Lion Installer App. When I run ./instaUp2Date.py 10.7_vanilla --process I get the error Unable to find OS Installer disc in any provided folder. What should I try to get this going? I reviewed the other strings and a reboot has not fixed it. I've tried alternate locations for the installer disc without success. Thanks!