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

I ran into this on Xcode 8, and I was able to

• save my corrupt storyboard changes on a git branch.
• switched to a different branch revert to an older commit before the Storyboard got corrupted
• view storyboard file in Xcode
• switch to back to branch with corrupt storyboard, and Xcode didn't crash while still viewing the storyboard file