(If you prefer Japanese than English, you can see Japanese article.) The environment in this situation Windows 10 Home Edition Visual Studio Enterprise 2015 Version 14.0.25123.00 Update 2 Xamarin 4.1.0.530 (2e39740) Xamarin.Android 6.1.0.7…

Xamarin.Android error such as "$(_DeviceSdkVersion)" that evaluates to "" instead of a number