iOS App only works in interpreter mode?

I have an air application that I am packaging for iOS.

If the target is ipa-debug-interpreter or ipa-test-interpreter the app works just fine.

However, any other target it crashes when trying to use assets. I have seen the following exception:

[Fault] exception, information=ReferenceError: Error #1065: Variable FlexVersion is not defined.

Fault, SpriteAsset() at SpriteAsset.as:131

131               if (appDomain.hasDefinition("mx.core::FlexVersion"))

Other times it will crash with no stack.

Why would it only work when the target includes interpreter?

Any thoughts would be helpful!

Thanks!