UIViewController called from Storyboard is nil - ios

Question

I am calling a view with method;
[self.storyboard instantiateViewControllerWithIdentifier:];
Yesterday, this method was working well, but after some time something happened, it has stopped working.
I am using both xCode6 beta 6 and xcode5 v5.1.1
My code is as below, here all objects of an ViewController is nil?
What is wrong with this?
(IBAction)addTemplateViewPressed:(id)sender
{
PhotoTemplateViewController *templateVC = [self.storyboard instantiateViewControllerWithIdentifier:#"photoTemplateViewController"];
//NSLog(#"%#",NSStringFromCGRect(templateVC.view.frame));
if(photoVerticalArray.count !=0 )
{
photoVerticalArray = [templateVC setVerticalImages:photoVerticalArray];
}
else
{
verticalFinished = true;
}
if(photoHorizontalArray.count !=0)
{
photoHorizontalArray = [templateVC setHorizontalImages:photoHorizontalArray];
}
else
{
horizontalFinished = true;
}
if(!verticalFinished && !horizontalFinished)
{
CGRect temp = templateVC.mainView.frame;
if(lastPosition == 0)
{
temp.origin.y = lastPosition = templateVC.mainView.frame.origin.y+48;
}
else
{
lastPosition = temp.origin.y= lastPosition + temp.size.height-4;
}
templateVC.view.frame = temp;
[mainView addSubview:templateVC.view];
NSLog(#"%#",NSStringFromCGSize(mainScrollView.contentSize));
[mainScrollView setContentSize:CGSizeMake(0, temp.origin.y+temp.size.height+50)];
NSLog(#"%#",NSStringFromCGSize(mainScrollView.contentSize));
}