Erro no onCreate(bundle) Xamarim

olá boa noite estou com o seguinte problema no oncreate(bundle)

Descrição do erro:

System.TypeLoadException: Could not resolve type with token 010001c6 (from typeref, class/assembly Android.OS.BaseBundle, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065)

ja tentei reinstalar o xamarim.forms como dito em outro post, no entanto sem sucesso,

código nuguete

using System;

using Android.App;
using Android.Content.PM;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

namespace TestDrive.Droid
{
    [Activity (Label = "TestDrive", Icon = "@drawable/icon", Theme="@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate (Bundle bundle)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar; 

            base.OnCreate (bundle);

            global::Xamarin.Forms.Forms.Init (this, bundle);
            LoadApplication (new TestDrive.App ());
        }
    }
}

alguem poderia me ajduar fazendo favor?