iPhone App Signature Invalid. Disallowed Signer.

Google has 4 hits for "disallowed signer". That doesn't bode well.

mlm@Matthew-McClures-MacBook-Pro ~/tmp
$ codesign -d iMapMyRide.app
Executable=/Users/mlm/tmp/iMapMyRide.app/iMapMyRide

mlm@Matthew-McClures-MacBook-Pro ~/tmp
$ echo $?
0

mlm@Matthew-McClures-MacBook-Pro ~/tmp
$ /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/Validation -verbose iMapMyRide.app
Validating iMapMyRide.app -verbose warnings
warning: Application failed codesign verification.  The signature was invalid, or it was not signed with an Apple submission certificate. (-19011)
Executable=/Users/mlm/tmp/iMapMyRide.app/iMapMyRide
codesign_wrapper-0.7.9: using Apple CA for profile evaluation
Disallowed signer
 - (null)