Carousel view in Xamarin.forms in visual studio

hi, i am knew to xamarin.forms i am trying to work with xamarin.forms carousel view but it is showing error everytime.I installed all latest xamarin.forms.carouselview packages from nuget but the the problem remains same.

namespace:

xmlns:cv="clr-namespace:Xamarin.Forms;assembly=Xamarin.Forms.CarouselView"

Here the label,listview,image etc templates are not visible

Can anybody tell me please