cloudkitty-processor return error "'module' object has no attribute 'DefaultRPCAccessPolicy'"

[juanjuan li]

I tried to install cloudkitty on openstack-newton by following the link : http://cloudkitty.readthedocs.io/en/stable/installation.html#configure-cloudkitty here.
I installed from source and keystone version I used was 3.Everything goes well without errors until I run the final command : cloudkitty-processor --config-file /etc/cloudkitty/cloudkitty.conf.
Here is the message:

[root@allinone cloudkitty]# cloudkitty-processor --config-file /etc/cloudkitty/cloudkitty.conf
Option "verbose" from group "DEFAULT" is deprecated for removal. Its value may be silently ignored in the future.
2017-07-07 13:49:16.779 17689 CRITICAL cloudkitty [-] AttributeError: 'module' object has no attribute 'DefaultRPCAccessPolicy'
2017-07-07 13:49:16.779 17689 ERROR cloudkitty Traceback (most recent call last):
2017-07-07 13:49:16.779 17689 ERROR cloudkitty File "/usr/bin/cloudkitty-processor", line 10, in <module>
2017-07-07 13:49:16.779 17689 ERROR cloudkitty sys.exit(main())
2017-07-07 13:49:16.779 17689 ERROR cloudkitty File "/usr/lib/python2.7/site-packages/cloudkitty/cli/processor.py", line 24, in main
2017-07-07 13:49:16.779 17689 ERROR cloudkitty processor = orchestrator.Orchestrator()
2017-07-07 13:49:16.779 17689 ERROR cloudkitty File "/usr/lib/python2.7/site-packages/cloudkitty/orchestrator.py", line 227, in __init__
2017-07-07 13:49:16.779 17689 ERROR cloudkitty self._init_messaging()
2017-07-07 13:49:16.779 17689 ERROR cloudkitty File "/usr/lib/python2.7/site-packages/cloudkitty/orchestrator.py", line 253, in _init_messaging
2017-07-07 13:49:16.779 17689 ERROR cloudkitty self.server = messaging.get_server(target, endpoints)
2017-07-07 13:49:16.779 17689 ERROR cloudkitty File "/usr/lib/python2.7/site-packages/cloudkitty/messaging.py", line 64, in get_server
2017-07-07 13:49:16.779 17689 ERROR cloudkitty access_policy = dispatcher.DefaultRPCAccessPolicy
2017-07-07 13:49:16.779 17689 ERROR cloudkitty AttributeError: 'module' object has no attribute 'DefaultRPCAccessPolicy'
2017-07-07 13:49:16.779 17689 ERROR cloudkitty

I looked at the /usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py and found out that there is NO "DefaultRPCAccessPolicy" class in it, which it is supposed to have this class if you look up at the github: https://github.com/openstack/oslo.messaging/blob/master/oslo_messaging/rpc/dispatcher.py

Here is the front of the dispatcher.py from my environment and I attached it:

"
....

__all__ = [
    'NoSuchMethod',
    'RPCDispatcher',
    'RPCDispatcherError',
    'UnsupportedVersion',
    'ExpectedException',
]

import logging
import sys

import six

from oslo_messaging import _utils as utils
from oslo_messaging import dispatcher
from oslo_messaging import serializer as msg_serializer
from oslo_messaging import server as msg_server
from oslo_messaging import target as msg_target

LOG = logging.getLogger(__name__)

...

"

I think this is maybe the bug and I dont know how to fix it.

Thank you