I\'m fighting with that issue for 2 days already and can\'t find any solution.
I have an Xamarin Android app in Visual Studio 2017 consisting of three projects:
Another reason for this error, if that the android NDK (not android SDK) isn't right, change de version can resolve the problem: go to Tools/Options/Xamarin/android Configurator and change de folder, in my case I've three, the last one can't compile, but the second folder with version xx.r11c do it.

