Android推送通知失败(注册无效)

我已经成功地向iOS设备发送了推送消息，但我在Android上遇到了问题。我已经得到了GCM API密钥和安装了应用程序的设备的注册id。

当我尝试发送推送消息时，触发了NotificationFailed事件。我得到的异常类型是PushSharp.Android.GcmMessageTransportResponse，其消息是"无效注册"。我到底做错了什么?

var push = new PushBroker();
push.OnNotificationSent += NotificationSent;
push.OnChannelException += ChannelException;
push.OnServiceException += ServiceException;
push.OnNotificationFailed += NotificationFailed;
push.OnDeviceSubscriptionExpired += DeviceSubscriptionExpired;
push.OnDeviceSubscriptionChanged += DeviceSubscriptionChanged;
push.OnChannelCreated += ChannelCreated;
push.OnChannelDestroyed += ChannelDestroyed;
push.RegisterGcmService(new GcmPushChannelSettings("AIXXXXXXXXXXXXXXXX"));
push.QueueNotification(new GcmNotification()
             .ForDeviceRegistrationId("APAXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
.WithJson("{'"alert'":'"Hello World!'",'"badge'":7,'"sound'":'"sound.caf'"}");
push.StopAllServices();