I had the same error plus other problems with my comp after I hastily reset keychains to default. My problem was fixed after I restored the old keychain as explained here: https://discussions.apple.com/thread/7468150 Alternatively, I was going to system restore

Nice, thanks! FYI, In xcode beta I had to do the following to make this run: change .id to .self Nest the form in a NavigationView