[Users] presence

Hi all, I am using openser-1.2.1+RTPProxy. I am using XLite as UA. I want to be able to store the buddy list of the users at the server. For this, I am using the presence module. But I cannot get it working. I have created the presence related tables in mysql. And those tables do show some information in them. I have attached my openser.cfg and the message dump from wireshark. The messages have been captured at the UA end. I also get the following message at the server.

PRESENCE: handle_subscribe:Missing or unsupported event header field value 2(12452) PRESENCE:handle_subscribe: ERROR occured 2(12452) WARNING: script writer didn't release transaction

Am I missing something basic here? Please reply. Thank you Kumar