1SOLUTION:
2
3Sometimes when testing on a device, the app doesn't uninstall properly.
4To verify and fix this:
5
61.Go to Settings.
72.Go to Apps.
83.Select your app. (here, you can verify that your app is not uninstalled properly).
94.Open the overflow menu on the top right and select Uninstall for all users.
10Done. Try to install then launch your app again.