Nib from different class

Nib from different class

I have tried several other examples, on this site and others, but for the
life of me I cannot get this to work.
I have a NIB file which is a part of the class "ViewController2". I need
to use a few of the views in this NIB file in my "ViewController1" class.
Each time I call [[NSBundle mainBundle]loadNibNamed:@"ViewController2"
owner:self options:nil]; it causes a crash, saying that one of my
UIButtons is not KVC compliant, but I have properly linked all the buttons
and outlets, to no avail.
Any help would be extremely appreciated! Thank you in advance!