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

*** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named IBNSLayoutConstraint'

I just update Xcode to 7.2 then i start to check is everything alright. but I have this error and it crashes. I dig this problem, everybody said that "Make sure you don't have any constraints installed for views that aren't installed." but I don't have any uninstalled constrains. and I don't have any NSLayoutConstraint outlets. Thanks a lot.

Solution

You probably using InterfaceBuilder Storyboard for localization. You should also consider them and remove inactive constraits inside them or use Localizable Strings for localization.

You can also check this answer.