xcode 9 crash when open storyboard

Question

XCode 9 GM Candidate 1 is currently crashing when opening a storyboard.

ProductBuildVersion: 9A235

UNCAUGHT EXCEPTION (NSInternalInconsistencyExcepti         


        

Answer 1

I found that the previously installed versions of XCode were the root of the problem. I thought I only had one version installed but upon right-clicking an XCode project file, I saw that under 'Open With..', there were tons of versions. There were old beta versions of XCode 9, as well as various versions of the stable release and even XCode 8.

None of these versions could be found in my mac's Applications directory, so I realized that they were dormant in the Downloads directory. What I did was delete all of them and boom, storyboard not freezing XCode 9.3 anymore.