Transform from ios6 to ios7

Transform from ios6 to ios7

I have an universal app where I successfully upgraded the iPhone component
to ios7. The ipad component however is not running anymore. I get the
following error:
Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: '-[UISplitViewController tabBar]: unrecognized selector sent to
instance 0x8d9eef0'
I have no idea what happened. it did not touch the ipad side of things
whatsoever.
I am running: 11A4449d build and 5A11365y build for x-code on a mac machine.
After this code the error happens:
(void) awakeFromNib { [super awakeFromNib];
// whenever I come out of a storyboard, I make myself the delegate of any
splitview I am in self.splitViewController.delegate = self; }