why Xcode 7.2 crash 'Could not instantiate class named IBNSLayoutConstraint'?

Select Storyboard Disable Size class resolve my problem. Hope this will help you! Thanks After build your project you can again enable size class.

In my case I had "padView" that was not installed in any/any size class and was installed in regular/regular size class, but it's subviews were installed in all size classes.

"PadView" settings:

"PadView" subviews settings:

When I changed "PadView" subviews installation settings to the same as "PadView" settings my problem was resolved.