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BUMP - Anyone else seen this? I've since found some people with the same error, but for what appears to be different reasons.
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I have the same problem. However you don't have to re-download Xcode to get the extensions back. Just drag Xcode from the Applications folder to somewhere else. Desktop is fine. Then drag it back. The act of adding Xcode to the Applications folder (again) triggers whatever it is in OS X that reads the extensions.
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Digging around in the crash logs I found references to the Thread Sanitizer. So I turned it off and now I have this error:Points Master.app: Error Domain=com.apple.dt.UITestingAgent Code=-1 "Preview provider "13Points_Master17MainView_PreviewsV" does not exist" UserInfo={NSLocalizedDescription=Preview provider "13Points_Master17MainView_PreviewsV" does not exist}So I was thinking one step a head then I figured out my project didn't have the 'DEBUG' active compilation condition so the SwiftUI preview functions where not visible to Xcode.It's all now working.