iphone app is working on simulator but not on device

Question

my app is working fine on simulator but not on device... I am able to see only first views of each tab as I used UITabViewController ..

After trying a lot when I replaced one of UIViewController by taking .xib i.e. by using interface builder,I am able to see change on my iPhone. so,what will be the possible reasons of it? Is there any way to solve this problem without have to replacing all viewcontrollers? because replacement will not be worthwhile....

Thanks a lot!

Answer 1

I'm guessing this is a duplicate question, but check for capitalization. The simulator is not case sensitive, the devices are.