Error ADB0020: The package does not support the CPU architecture of this device when deploying Android app from Visual Studio to Android Emulator

Got this error message in Visual Studio 2017 with a Xamarin Android project deploying it to an Android emulator.

Error ADB0020: The package does not support the CPU architecture

How I fixed it:
https://forums.xamarin.com/discussion/149408/what-does-this-mean-i-get-this-each-time-i-build-after-coming-back-to-the-project?