Exception when trying to run SetOn implements from the MediaPlayer Xamarin API

Question

When I run my Xamarin Forms application with the MediaPlayer API of the error and the program stops running from these lines below;

video.SetOnPreparedListener(new videoLooping());

    [Activity(Label = "AppExibeVideo", MainLauncher = true)]
    public class MainActivity : Activity
    {

        VideoView video = null;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            video = FindViewById<VideoView>(Resource.Id.videoView);

            string path = "android.resource://" + PackageName + "/" + Resource.Drawable.a;
            video.SetVideoPath(path);
            video.SetOnPreparedListener(new videoLooping());
            video.RequestFocus();
            video.Start();

        }

        public class videoLooping : Java.Lang.Object, IOnPreparedListener
        {
            public void OnPrepared(MediaPlayer mp)
            {
                mp.Looping = true;
            }
        }

    }