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

just delete the app and try again, it happens to me when i try to launch over a device that has the same app but generated by an ipa file.