Same issue Here. Xcode is crashing after opening a storyboard file. Did you find a solution please ?

I followed all the steps, completely reset Xcode configurations, and tried multiple versions of Xcode, including betas, on different macOS versions. Currently, on Sequoia 15.2 beta with Xcode 16.1, Xcode no longer crashes, but Interface Builder displays incorrectly with a bug. All elements in Interface Builder are blue with warning "An internal error occurred. Editing functionality may be limited." I tried with a colleague’s MacBook with the same configurations as mine and everything is OK for him

I managed to stop Xcode from crashing, but the storyboard displays with a bug (everything is blue, and I can’t see the storyboard elements). It’s better than nothing; at least I can still make changes. Until a proper fix is available, if it can help someone, here are the steps I followed using the terminal: defaults delete com.apple.dt.Xcode rm -rf ~/Library/Application\ Support/Xcode rm -rf ~/Library/Caches/com.apple.dt.Xcode rm -rf ~/Library/Preferences/com.apple.dt.Xcode.plist rm -rf ~/Library/Developer/Xcode/DerivedData rm -rf ~/Library/Developer/Xcode Alternatively, repeat the same steps and then uninstall Xcode and reinstall it.

I managed to stop Xcode from crashing, but the storyboard displays with a bug (everything is blue, and I can’t see the storyboard elements). It’s better than nothing; at least I can still make changes. Until a proper fix is available, if it can help someone, here are the steps I followed using the terminal: defaults delete com.apple.dt.Xcode rm -rf ~/Library/Application\ Support/Xcode rm -rf ~/Library/Caches/com.apple.dt.Xcode rm -rf ~/Library/Preferences/com.apple.dt.Xcode.plist rm -rf ~/Library/Developer/Xcode/DerivedData rm -rf ~/Library/Developer/Xcode Alternatively, repeat the same steps and then uninstall Xcode and reinstall it.