Xcode 6 GM crashes when selecting the main storyboard or a xib

Question

I just downloaded the Xcode 6 GM and every time I select the main storyboard (and a specific xib) Xcode crashes.

The error to be sent to Apple contains the following

Answer 1

This was causing me a ton of trouble, and re-creating the storyboard wasn't an option. I got past it by ctrl/right clicking on the storyboard and doing

"Open As" > "Source Code"

I then made a small change, undid it and re-saved the file. Then I did

"Open As" > "Interface Builder - Storyboard"

It opened without crashing Xcode.