Get Service is not available for offline message

I got Service -unavailable cancel error when I am trying to retrieve the offline messages.

1. Prevent server to set presence to available: config.setSendPresence(true);

2. Connect to the server: connection.contect();

3. Login after connected to the server

4. Retrieve the Offline Message:

public void dealOfflineMsg() {

   try {

  OfflineMessageManager offlineManager = new OfflineMessageManager(connection);

List<Message> messages = offlineManager.getMessages();

   for (Message message : messages){

  ChatMessage chatMessage = getChatMessage(message);

  ChatMessage.save(service, chatMessage);

  }

  offlineManager.deleteMessages();

  Presence presence = new Presence(Presence.Type.available);

   connection.sendStanza(presence);

  }catch (Exception e){

  showToast("Offline Message Error: " + e.getLocalizedMessage());

  }

}

However, it throws error 'service-unavailable-cancel'.

How can I solve this issue?