cuncurrent-session control

Hello ALL I have Some problem in using Unlang. I need to call some function in PostgreSQL database send some parameter from request attribute to it , get replay from function and then change some check attribute item (such as Pool-Name).or replay attribute Unlang : cuncurrent-session-status =”{%sql:select public.findout_cuncurrent_sessions_for_a_user(%{request:User-Name},%{request:Acct-Session-Id},%{request:NAS-IP-Address},%{request:NAS-Port})}”; if (cuncurrent-session-status=='Accept') { ok } elseif (cuncurrent-session-status=='Reject') { update control {Pool-Name='Exceeded-Concurrent-Session'} } i know that i have some mistake in script but i can not find where !!!!!