Button action issue in xcode 4.6

Button action issue in xcode 4.6

I am using xcode 4.6 and i have set iOS deployment target to 4.3. When I
build and run in iOS simulator 6.1, i was able to navigate to next
viewController. But, when I build and run for iOS 5.0 or 5.1, nothing
happens on button click. Does anyone have solution to this? Can't see any
bug in my code. Is it a common issue?
I have used NSString *emailRegEx =
@"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}"; NSPredicate *emailTest
= [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
in ibaction