Storyboard error

In my Storyboard, on my viewcontrollers there is a red error (!) icon in the bottom right corner, when I click on it the following exception is displayed:

Also, not sure if related but when I open the Storyboard, certain controls disappear (buttons, imageviews - but not textfields and labels) even though they're still visible in the Document Outline, if I set the view mode to Landscape and then back to Portrait the controls appear.

Have attached log files.

Is this a known issue? Any ideas how to fix?

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