Firebase错误在这里发生了什么

Question

当我从firebase发送通知时，只显示通知标题。它工作但现在它不起作用。

  private void showNotification(String message) {

    Intent i=new Intent(this,MainActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent=PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
    builder.setAutoCancel(true);
    builder.setContentTitle("Bildirim");
    builder.setSmallIcon(R.mipmap.ic_launcher);
    builder.setTicker("selam dost.mesaj geldi");
    builder.setDefaults(Notification.DEFAULT_ALL);
    builder.setContentIntent(pendingIntent);
    NotificationManager notificationManager= (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    notificationManager.notify(0,builder.build());
}
}

我现在正在接收这样的消息：“V / GoogleSignatureVerifier：com.google.android.gms签名无效。发现”这发生了什么事？