network.log:2013-09-18 12:35:31.019 ERROR nova.openstack.common.rpc.common [req-f01311f9-c1a1-4c49-b5cf-e9629c68877b 6ef8a579518540349aceb34c51337fe1 c62ee9384b144df8a53b13ec602d9215] ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/amqp.py", line 430, in _process_data\n    rval = self.proxy.dispatch(ctxt, version, method, **args)\n', '  File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/dispatcher.py", line 133, in dispatch\n    return getattr(proxyobj, method)(ctxt, **kwargs)\n', '  File "/usr/lib/python2.6/site-packages/nova/network/manager.py", line 575, in get_instance_nw_info\n    instance_uuid)\n', '  File "/usr/lib/python2.6/site-packages/nova/db/api.py", line 549, in virtual_interface_get_by_instance\n    return IMPL.virtual_interface_get_by_instance(context, instance_id)\n', '  File "/usr/lib/python2.6/site-packages/nova/db/sqlalchemy/api.py", line 114, in wrapper\n    return f(*args, **kwargs)\n', '  File "/usr/lib/python2.6/site-packages/nova/db/sqlalchemy/api.py", line 126, in wrapper\n    instance_get_by_uuid(context, instance_uuid)\n', '  File "/usr/lib/python2.6/site-packages/nova/db/sqlalchemy/api.py", line 114, in wrapper\n    return f(*args, **kwargs)\n', '  File "/usr/lib/python2.6/site-packages/nova/db/sqlalchemy/api.py", line 1530, in instance_get_by_uuid\n    return _instance_get_by_uuid(context, uuid)\n', '  File "/usr/lib/python2.6/site-packages/nova/db/sqlalchemy/api.py", line 114, in wrapper\n    return f(*args, **kwargs)\n', '  File "/usr/lib/python2.6/site-packages/nova/db/sqlalchemy/api.py", line 1540, in _instance_get_by_uuid\n    raise exception.InstanceNotFound(instance_id=uuid)\n', 'InstanceNotFound: Instance 9621c15d-e8e5-4eae-8f53-970585f65a2d could not be found.\n']