I was working on an Android project using Xamarin in Visual Studio 2012. I recently upgraded from an HDD to a SSD so I reinstalled Windows and all of my programs.
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Whenever I encounter this problem, I publish the app and install in manually using
adb install ""
in the Android Adb Command Prompt.
Hopefully, a fix is out soon, according to https://github.com/xamarin/xamarin-android/issues/3727