error getting installer disk

latest instaDMG using a 11E53 installer disk - trying to compile a test image importdisk worked and the 11E53 image is in the InstallerDiscs folder However, when I run insta2update, I get the following error: Finding the Installer disc for 10.7_Common Traceback (most recent call last): File "./instaUp2Date.py", line 716, in main() File "./instaUp2Date.py", line 678, in main foundInstallerDiscs = findInstallerDisc.findInstallerDisc(allowedBuilds=thisController.installerDiscBuilds) File "/Users/rbwong/InstaDMG/AddOns/InstaUp2Date/Resources/findInstallerDisc.py", line 28, in findInstallerDisc raise ValueError('The allowedBuild item is not in the correct form: ' + thisItem) ValueError: The allowedBuild item is not in the correct form: What is this exactly saying?