exception.NotFound occurred when installing nova-objectstore in a different marchine from nova-compute

I tried to install nova-objectstore on a different machine from nova-compute. But I got the following error.

2011-04-14 15:07:31,360 DEBUG nova.utils [-] Running cmd (subprocess): sudo iptables-restore from (pid=24064) execute /usr/lib/pymodules/python2.6/nova/utils.py:150
2011-04-14 15:07:31,390 DEBUG nova.utils [-] Running cmd (subprocess): mkdir -p /var/lib/nova/instances/instance-00000001/ from (pid=24064) execute /usr/lib/pymodules/python2.6/nova/utils.py:150
2011-04-14 15:07:31,396 INFO nova.virt.libvirt_conn [-] instance instance-00000001: Creating image
2011-04-14 15:07:31,469 DEBUG nova.utils [-] Attempting to grab semaphore "5d5fa351" for method "call_if_not_exists"... from (pid=24064) inner /usr/lib/pymodules/python2.6/nova/utils.py:594
2011-04-14 15:07:31,478 ERROR nova.compute.manager [JI-KOPJNBE64MT5FCXWJ anne IRT] Instance '1' failed to spawn. Is virtualization enabled in the BIOS?
(nova.compute.manager): TRACE: Traceback (most recent call last):
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/compute/manager.py", line 234, in run_instance
(nova.compute.manager): TRACE: self.driver.spawn(instance_ref)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/exception.py", line 120, in _wrap
(nova.compute.manager): TRACE: return f(*args, **kw)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/virt/libvirt_conn.py", line 616, in spawn
(nova.compute.manager): TRACE: self._create_image(instance, xml, network_info)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/virt/libvirt_conn.py", line 841, in _create_image
(nova.compute.manager): TRACE: project=project)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/virt/libvirt_conn.py", line 776, in _cache_image
(nova.compute.manager): TRACE: call_if_not_exists(base, fn, *args, **kwargs)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/utils.py", line 607, in inner
(nova.compute.manager): TRACE: retval = f(*args, **kwargs)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/virt/libvirt_conn.py", line 774, in call_if_not_exists
(nova.compute.manager): TRACE: fn(target=base, *args, **kwargs)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/virt/libvirt_conn.py", line 787, in _fetch_image
(nova.compute.manager): TRACE: images.fetch(image_id, target, user, project)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/virt/images.py", line 51, in fetch
(nova.compute.manager): TRACE: metadata = image_service.get(elevated, image_id, image_file)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/image/local.py", line 116, in get
(nova.compute.manager): TRACE: raise exception.NotFound
(nova.compute.manager): TRACE: NotFound: None
(nova.compute.manager): TRACE:
2011-04-14 15:07:48,960 INFO nova.compute.manager [-] Found instance 'instance-00000001' in DB but no VM. State=8, so setting state to shutoff.
2011-04-14 15:07:48,960 INFO nova.compute.manager [-] DB/VM state mismatch. Changing state from '8' to '5'
2011-04-14 15:08:49,053 INFO nova.compute.manager [-] Found instance 'instance-00000001' in DB but no VM. State=5, so setting state to shutoff.
2011-04-14 15:09:49,087 INFO nova.compute.manager [-] Found instance 'instance-00000001' in DB but no VM. State=5, so setting state to shutoff.

The version I used is 2011.2~gamma2~bzr987-0ubuntu0ppa1~maverick1. And the content of nova.conf is as followings.

--sql_connection=mysql://root:nova@ubuntu2/nova
--s3_host=ubuntu2
--rabbit_host=192.168.32.202
--cc_host=192.168.32.202
--ec2_url=http://192.168.32.202:8773/services/Cloud

--daemonize=1

--dhcpbridge_flagfile=/etc/nova/nova.conf
--dhcpbridge=/usr/bin/nova-dhcpbridge

--FAKE_subdomain=ec2

--ca_path=/var/lib/nova/CA
--keys_path=/var/lib/nova/keys
--networks_path=/var/lib/nova/networks
--instances_path=/var/lib/nova/instances
--images_path=/var/lib/nova/images
--buckets_path=/var/lib/nova/buckets

--libvirt_type=kvm

--network_manager=nova.network.manager.FlatManager

--vlan_interface=eth0

--logdir=/var/log/nova
--verbose
--volume_group=ubuntu1
--fixed_range=10.0.0.0/8
--network_size=5000
--lock_path=/var/lib/nova/tmp
--flat_interface=eth0

BTW, I succeeded in the same case when using Bexar before.