ERROR nova.rpc.impl_qpid [-] Unable to connect to AMQP server: None(already open)

I'm getting below error from compute_log and my instance is sitting at build state

2012-07-26 16:28:01 ERROR nova.rpc.impl_qpid [-] Unable to connect to AMQP server: None(already open)
2012-07-26 16:28:02 ERROR nova.rpc.impl_qpid [-] Unable to connect to AMQP server: None(already open)
2012-07-26 16:28:03 ERROR nova.rpc.impl_qpid [-] Unable to connect to AMQP server: None(already open)
2012-07-26 16:28:04 ERROR nova.rpc.impl_qpid [-] Unable to connect to AMQP server: None(already open)
2012-07-26 16:28:05 ERROR nova.rpc.impl_qpid [-] Unable to connect to AMQP server: None(already open)
2012-07-26 16:28:06 ERROR nova.rpc.impl_qpid [-] Unable to connect to AMQP server: None(already open)

 nova list
+--------------------------------------+---------+--------+----------+
| ID | Name | Status | Networks |
+--------------------------------------+---------+--------+----------+
| 9021010f-e67e-434f-9228-f9b275fcb99e | Centos5 | BUILD | |

# /etc/init.d/rabbitmq-server status
Status of node rabbit@HOSTNAME ...
[{pid,7715},
 {running_applications,[{rabbit,"RabbitMQ","2.6.1"},
                        {os_mon,"CPO CXC 138 46","2.2.7"},
                        {sasl,"SASL CXC 138 11","2.1.10"},
                        {mnesia,"MNESIA CXC 138 12","4.5"},
                        {stdlib,"ERTS CXC 138 10","1.17.5"},
                        {kernel,"ERTS CXC 138 10","2.14.5"}]},
 {os,{unix,linux}},
 {erlang_version,"Erlang R14B04 (erts-5.8.5) [source] [64-bit] [smp:16:16] [rq:16] [async-threads:30] [kernel-poll:true]\n"},
 {memory,[{total,25676288},
          {processes,9966920},
          {processes_used,9959800},
          {system,15709368},
          {atom,1119593},
          {atom_used,1112678},
          {binary,83728},
          {code,11053747},
          {ets,742688}]}]
...done.

# for n in api compute network objectstore scheduler cert ; do service openstack-nova-$n status; done
openstack-nova-api (pid 8942) is running...
openstack-nova-compute (pid 8957) is running...
openstack-nova-network (pid 8976) is running...
openstack-nova-objectstore (pid 8995) is running...
openstack-nova-scheduler (pid 9014) is running...
openstack-nova-cert (pid 9048) is running...

Any idea?

Thanks,
--Truong