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I have downloaded Xcode 12, the newest version, from App Store. On my exising iOS project, I added a WatchKit app with deployment target of watchOS 7.0. However, when I try to run the watch app on simulator, it tries to install then gives me this error in an alert: This app could not be installed at this time. Could not install at this time. WatchKit 1.0 apps are no longer installable on this watchOS version. I don't know what's wrong with the target that causes it to give this error. Like said before, the deployment target for the app is watchOS 7 and the app uses SwiftUI. I also can't get a preview on SwiftUI because it gives me the same error saying cannot install. I have another iOS project with a WatchKit app that is running just fine. Do you have this problem also or know how to resolve it? Any help is appreciated.

I was having a problem when trying to install the third macOS Mojave public beta in the System Preferences. When I click the "Update Now" button, a popup comes up saying "Installation failed, An error occurred while installing the selected updates." And I could not install the update. Does anyone know what the problem is and why I couldn't install the update? Thanks.