Xcode 9 Storyboard: an internal error occurred. editing functionality may be limited
I fixed this issue by-
- updating my Mac to MacOS High Siera
- deleted Xcode
- installed new Xcode from AppStore
XCode - an internal error occured
Problem: This things happened frequently sometimes on project that contains both Objective C & Swift code.
Solution: Updating XCode version fixed my problem, nothing of the solution mentioned in comment worked for me
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