Not able to chat in the group when group admin is in offline (Mobile Application)


I am developing a mobile chat application by using Open fire, XMPP Server. I am able to create Group, adding members to group. I am able to do chat when the admin is in Online.

When Admin is Offline, Able to send the messages from mobile to server and getting the confirmation from the server But the message is not posting in the group. Kindly help me on this whether is there any Admin Privileges if admin is in offline or ???