Error while Launching activity

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I had exactly this same problem today [Android Studio 2.3.3, Android 8.0 on the phone]

This is what I discovered. The app that I was trying to install was not shown in the android Application window [the one where you have them all]. But once I went in: Settings->Apps&Notifications->AppInfo I could see this screenshot where it was said that this app was “not installed for this user”:

enter image description here

At that point I entered the app->clicked on the three points in the top right corner->Uninstall for all the users

Now when I tried to run the project through Android Studio the error message disappeared and the app was correctly installed

Hope this helps, have a good day
Antonino

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