Error with AdMob custom renderer..

I am trying below code but having errors..

'AdMobRenderer.OnElementChanged(ElementChangedEventArgs)': no suitable method found to override

'View' is an ambiguous reference between 'Xamarin.Forms.View' and 'Android.Views.View'

'AdMobRenderer.OnElementPropertyChanged(object, PropertyChangedEventArgs)': no suitable method found to override

The type or namespace name 'PropertyChangedEventArgs' could not be found (are you missing a using directive or an assembly reference?)

Argument 1: cannot convert from 'Xamarin.Forms.Platform.Android.ElementChangedEventArgs<Xamarin.Forms.View>' to 'Xamarin.Forms.Platform.Android.ElementChangedEventArgs<Samana.AdMobView>'

Kindly helpp....

here is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Gms.Ads;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
using Samana.Droid;
using Samana;

[assembly: ExportRenderer(typeof(AdMobView), typeof(AdMobRenderer))]
namespace Samana.Droid
{
    public class AdMobRenderer : ViewRenderer<AdMobView, AdView>
    {
        Context context;

        public AdMobRenderer(Context _context) : base(_context)
        {
            context = _context;
        }

        protected override void OnElementChanged(ElementChangedEventArgs<AdMobView> e)
        {
            base.OnElementChanged(e);

            if (e.NewElement != null && Control == null)
                SetNativeControl(CreateAdView());
        }

        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            if (e.PropertyName == nameof(AdView.AdUnitId))
                Control.AdUnitId = Element.AdUnitId;
        }

        private AdView CreateAdView()
        {
            var adView = new AdView(Context)
            {
                AdSize = AdSize.SmartBanner,
                AdUnitId = Element.AdUnitId
            };

            adView.LayoutParameters = new LinearLayout.LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent);

            adView.LoadAd(new AdRequest.Builder().Build());

            return adView;
        }
    }
}

Kindly help....

Thanks,
Jassim