As @Anil Varghese pointed out that the problem is the size of the view. Everything except WAny hAny will raise this warning when you open the storyboard file. I think this is an Xcode error. 
Therefore, I needed to make sure that my views were configured as in the picture above. This means designing for all sizes, so in my case my user interface got messed up and I had to redesign it. But it was for the best!
When you switch to wAny hAny, you will see elements that become invisible because they are tied to other size classes (e.g. wCompact hAny). You need to remove these rules from the attribute inspector.
Dănuț Mihai Florian Feb 25 '15 at 17:20 2015-02-25 17:20
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