How to handle MAC app compatibility

Hello All,

I have developed an application on X code 4.2 on Snow Leopard MAC OS and the same MAC app is not working on a different system having MAC OS Lion.
What can be the issue ?

Please help as I am a newbie in development of MAC.Do I need to upgrade the Xcode or include some extra libraries to handle this ?

Thanks,
Najmul

you could always seed the app to a few on the mac forums, we do have a lot of users with various set-ups

Thanks

Thanks for the reply. But its a client app on which I am working and would not be able to seed.
Any other method which could think of, perhaps ?