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I had this problem.I *think* that I fixed it, by altering the bundle identifier from the default apple identifier, and making sure that I was using my team that has an active developer account.However on a late 2016 MacBook Pro 13" with touchbar, the whole codebase for those downloaded tutorials is so buggy that I'm constantly having to clean, rebuild and manually delete derived data files to get the app and preview to work, so I can't be entirely sure that any one action is what fixed it.I hope this is helpful.
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I'm having exactly the same problem, with the same project.XCode 11.1Cleaning the build folder hasn't worked. Neither has clearing out the derived data folders.