Android 收到推送通知且应用程序关闭时应用程序崩溃

收到推送通知时，我的Xamarin Android应用程序崩溃

以下是错误：

System.NotSupportedException:无法将Java类型为“md53ff9574f15073ce2830b1527af878807/GcmListener”的JNI句柄0xbee2dcd8（密钥句柄0x1302a92b）激活为托管类型“DriversInfo.Droid.GcmListener”。-->System.ArgumentNullException:值不能为null

以下是接收通知的代码（GCMListener）：

以及显示通知的代码：

        public static bool DisplayNotification(Context context, string title, string desc,
                                           NotificationId notificationId = 0)
    {
        // Set up an intent so that tapping the notifications returns to this app:
        Intent intent = new Intent(context, typeof(MainActivity));
        intent.SetFlags(ActivityFlags.ClearTop | ActivityFlags.SingleTop);

        // Create a PendingIntent; we're only using one PendingIntent (ID = 0):
        const int pendingIntentId = 0;
        PendingIntent pendingIntent =
            PendingIntent.GetActivity(context, pendingIntentId, intent, PendingIntentFlags.UpdateCurrent);

        var builder = new NotificationCompat.Builder(context)
            .SetAutoCancel(true)
            .SetContentTitle(title)
            .SetContentText(desc)
            .SetContentIntent(pendingIntent)
            .SetSmallIcon(Resource.Drawable.Logo);

        //if (Settings.AppAcceptsSoundNotifications)
        builder.SetSound(RingtoneManager.GetDefaultUri(RingtoneType.Notification));

        // Build the notification:
        var notification = builder.Build();

        // Get the notification manager:
        var notificationManager = context.GetSystemService(Context.NotificationService) as NotificationManager;

        notificationManager?.Notify((int) notificationId, notification);
        return true;
    }

我没有写这段代码，我想了解更多！ 我对新的Xamarin/Android开发者有点失望，需要社区帮助/解释

谢谢；）

编辑

以下是有关应用程序崩溃的更多详细信息（无上下文）：

AndroidRuntime参数名称：Autofac.ResolutionExtensions.ResolveService处的上下文（Autofac.IComponentContext，Autofac.Core.Service，System.Collections.Generic.IEnumerable

1[T]参数）[0x00003]in:0处的Autofac.ResolutionExtensions.Resolve（Autofac.IComponentContext，System.Type serviceType，System.Collections.Generic.IEnumerable

1[T]参数）[0x00007]in:0在Autofac.ResolutionExtensions.Resolve[TService]（Autofac.IComponentContext，System.Collections.Generic.IEnumerable`1[T]参数）[0x00000 in:0在Autofac.ResolutionExtensions.Resolve[TService]（Autofac.IComponentContext上下文）[0x00000]in:0位于DriversInfo.Droid.GcmListener..ctor（）[0x0000c]in:0位于（包装器动态方法）System.Object.6e5c2775-7f90-4dd7-a6af-e9481e583260（intptr，Object[]），位于Java.Interop.TypeManager.n_（System.IntPtr jnienv、System.IntPtr jclass、System.IntPtr typename_ptr、System.IntPtr signature_ptr、System.IntPtr jobject、System.IntPtr parameters_ptr）[0x000df]in:0---内部异常堆栈跟踪的结束---在Java.Interop.TypeManager.n\u处激活（System.IntPtr jnienv，System.IntPtr jclass，System.IntPtr typename_ptr，System.IntPtr signature_ptr，System.IntPtr jobject，System.IntPtr parameters_ptr）[0x00168]in:0 at（包装器动态方法）System.Object.ae816e3f-b83f-4390-af32-80f1fa8830a2（IntPtr，IntPtr，IntPtr，IntPtr，IntPtr，IntPtr，IntPtr，IntPtr，IntPtr，IntPtr）在mono.android.TypeManager.n激活（本机方法）在md5c4b050970b34fabb7ecdb34ca8ce9387.GcmListener.java.23中的mono.android.TypeManager.Activate（TypeManager.java:7）在java.lang.reflect.Constructor.newInstance（本机方法）在java.lang.Class.newInstance（Class.java:1690）在android.app.ActivityThread.handleCreateService（ActivityThread.java:3657）中android.app.ActivityThread.access$2000（ActivityThread.java:219）android.app.ActivityThread$H.handleMessage（ActivityThread.java:1818）android.os.Handler.dispatchMessage（Handler.java:102）android.os.Looper.loop（Looper.java:145）android.app.ActivityThread.main（ActivityThread.java:6939）java.lang.reflect.Method（本机方法）invoke（本机方法）java.lang.reflect.Method.invoke（Method.java:372）位于com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1404）位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1199）

---

System.ArgumentNullException:值不能为null。

您需要调试它以确定什么是

null

，它是来自

，
数据的
，等等……我无法调试，因为应用程序此时已关闭！您知道怎么做吗？
        public static bool DisplayNotification(Context context, string title, string desc,
                                           NotificationId notificationId = 0)
    {
        // Set up an intent so that tapping the notifications returns to this app:
        Intent intent = new Intent(context, typeof(MainActivity));
        intent.SetFlags(ActivityFlags.ClearTop | ActivityFlags.SingleTop);

        // Create a PendingIntent; we're only using one PendingIntent (ID = 0):
        const int pendingIntentId = 0;
        PendingIntent pendingIntent =
            PendingIntent.GetActivity(context, pendingIntentId, intent, PendingIntentFlags.UpdateCurrent);

        var builder = new NotificationCompat.Builder(context)
            .SetAutoCancel(true)
            .SetContentTitle(title)
            .SetContentText(desc)
            .SetContentIntent(pendingIntent)
            .SetSmallIcon(Resource.Drawable.Logo);

        //if (Settings.AppAcceptsSoundNotifications)
        builder.SetSound(RingtoneManager.GetDefaultUri(RingtoneType.Notification));

        // Build the notification:
        var notification = builder.Build();

        // Get the notification manager:
        var notificationManager = context.GetSystemService(Context.NotificationService) as NotificationManager;

        notificationManager?.Notify((int) notificationId, notification);
        return true;
    }