Adding Xamarin.GooglePlayServices.Ads & Xamarin.Forms.Maps to Xamarin.Forms project causes error

I am using the latest version of Xamarin.forms and when I add Xamarin.GooglePlayServices.Ads & Xamarin.Forms.Maps to the project I get the following errors:

Attribute "imageAspectRationAdjust" has already been defined (APT0000)
Attribute "imageAspectRation" has already been defined (APT0000)
Attribute "circleCrop" has already been defined (APT0000)

I've tried this in a few projects and even made a fresh one. Anyone know how to fix this issue?