Unhandled Exception when opening ContentPage which uses Xamarin.Forms.Maps

I've downloaded version 2.2.0.45 of Xamarin.Forms.Maps for my PCL project and in order to make it work for the Android project I had to put to do the following customization in the Android Manifest:

The problem now is that every time I try to access the map content page I get an unhandled Exception. I tried to put try{} catch{} in the constructor of that page but still the exception appears to be unhandled..Any idea?