Nib from different class-Collection of common programming errors

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!