Can't get my itunes to install an app I developed and I don't know why

I've created an ad hoc distribution certificate and followed the instructions as far as I can tell. I'm trying to upload this new app to my wife's iphone and I continue to get an error after it copies it (it does show up in iTunes, but it doesn't have the app's image).

I'm desperate to get this done because it's a gift in several hours. Can anybody steer me in the right direction?