iOS app 'The application could not be verified' only on one device

Question

I have two iphone devices( 4s and 5 ) connected to my computer and i am trying to install an application in both the devices. It installs pretty well in iphone 5 but it give

Answer 1

The application could not be verified" , in your device there could be already an app installed with the same bundle identifier.

So Simple solution Just delete the App & try again.. ....