[Pacemaker] How to use votequorum for quorum provider?

[Mars gu]

hi,
   corosync-1.4.1-3.el6.x86_64
   pacemaker-1.1.5-8.el6.x86_64
 
   I want to use votequorum for my quorum provider.but some problems occured.
  if my  'corosync.conf ' is like that
 *************************************
totem {
        version: 2
        secauth: off
        threads: 0
        rrp_mode: none
        interface {
                ringnumber: 0
                bindnetaddr: 192.168.10.0
                mcastaddr: 226.94.2.1
                broadcast: no
                mcastport: 4000
        }
}
logging {
        timestamp: off
        fileline: off
        function_name: off
        to_stderr: no
        to_logfile: no
        to_syslog: yes
        logfile: /var/log/cluster/corosync.log
        debug: off
        logger_subsys {
                subsys: AMF
                debug: off
        }
}
service{
        name: corosync_quorum
        ver: 0
}
service{
        ver: 0
        name: pacemaker
        clustername: pcmk
}

quorum{
        provider: votequorum
        votes: 1
        expected_votes: 3
}
*********************************
it couldn't load the provider. the log is
***********************************
May 31 21:04:29 h10_147 corosync[2944]:  [QUORUM] Couldn't load quorum provider 
votequorum
May 31 21:04:29 h10_147 corosync[2944]:  [SERV  ] Service engine loaded: 
corosync cluster quorum service v0.1
***********************************
 
Help!
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