FATAL EXCEPTION: IntentService[null] about xamarin-plugins HOT 4 CLOSED

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

        AppContext = this.ApplicationContext;

        global::Xamarin.Forms.Forms.Init (this, bundle);

        //Sender Id pour com.vetup.imrvot => 845213152730
        CrossPushNotification.Initialize<CrossPushNotificationListener>("845213152730");

        StartPushService();
        LoadApplication (new App ());
    }

    public class YourAndroidApplication : Application
    {
        public static Context AppContext;

        public YourAndroidApplication(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
        {

        }

        public override void OnCreate()
        {
            base.OnCreate();

            AppContext = this.ApplicationContext;
                        
             //TODO: Initialize CrossPushNotification Plugin
             //TODO: Replace string parameter with your Android SENDER ID
             //TODO: Specify the listener class implementing IPushNotificationListener interface in the Initialize generic
             CrossPushNotification.Initialize<CrossPushNotificationListener>("<ANDROID SENDER ID>");

//This service will keep your app receiving push even when closed.              StartPushService();
        }

        public static void StartPushService()
        {
            AppContext.StartService(new Intent(AppContext, typeof(PushNotificationService)));

            if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Kitkat)
            {
        
                PendingIntent pintent = PendingIntent.GetService(AppContext, 0, new Intent(AppContext, typeof(PushNotificationService)), 0);
                AlarmManager alarm = (AlarmManager)AppContext.GetSystemService(Context.AlarmService);
                alarm.Cancel(pintent);
            }
        }

        public static void StopPushService()
        {
            AppContext.StopService(new Intent(AppContext, typeof(PushNotificationService)));
                        if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Kitkat)
            {
                PendingIntent pintent = PendingIntent.GetService(AppContext, 0, new Intent(AppContext, typeof(PushNotificationService)), 0);
                AlarmManager alarm = (AlarmManager)AppContext.GetSystemService(Context.AlarmService);
                alarm.Cancel(pintent);
            }
        }

    [Application]
public class VOT : Android.App.Application
{
    public static Context AppContext;

    public VOT (IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
    {
    }

    public override void OnCreate()
    {
        base.OnCreate();

        AppContext = this.ApplicationContext;

        //TODO: Initialize CrossPushNotification Plugin
        //TODO: Replace string parameter with your Android SENDER ID
        //TODO: Specify the listener class implementing IPushNotificationListener interface in the Initialize generic
        CrossPushNotification.Initialize<CrossPushNotificationListener>("845213152730");

        //This service will keep your app receiving push even when closed.              
        StartPushService();
    }