Downloaded and unarchived Building a Great Mac App with SwiftUI Set the team in Signing & Capabilities Built project Opened a view file with a preview provider -- e.g., GardenApp/Navigation/ContentView.swift Pressed "Resume" in preview pane. Result: "Cannot preview in this file -- Failed to launch Garden App.app" Diagnostic dialog says: FailedToLaunchError: Failed to launch Garden App.app /Users/pf/Library/Developer/Xcode/DerivedData/Session1-epkltatcrbtmzhclsybsiwjohcvx/Build/Intermediates.noindex/Previews/Garden App Start/Products/Debug/Garden App.app ================================== | HumanReadableNSError: The operation couldn’t be completed. (OSStatus error -10825.) | | NSOSStatusErrorDomain (-10825): | ==_LSFunction: _LSOpenStuffCallLocal | ==_LSLine: 3762 Xcode: Version 13.0 beta (13A5154h) Big Sur: 11.4 (20F71) Something's broken, but I don't know what. (Not a seasoned Xcode user.)