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In Bug 8144, Rolf says the bug has been fixed, but that was 4 months ago and still seems to exist. [https://bugzilla.xamarin.com/show_bug.cgi?id=8144]
[ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentNullException: Argument cannot be null.
Parameter name: view2
at MonoTouch.UIKit.NSLayoutConstraint.Create (MonoTouch.Foundation.NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation, MonoTouch.Foundation.NSObject view2, NSLayoutAttribute attribute2, Single multiplier, Single constant) [0x00055] in /Developer/MonoTouch/Source/monotouch/src/UIKit/NSLayoutConstraint.g.cs:129
Apple docs say this is OK:
Please re-open, with extra details, if you can duplicate this using the latest 6.2.x release.