openstack cluster service Exception raised: No module named Service

auth_config_hook(): {'auth_type': 'password', 'beta_command': False, u'compute_api_version': u'2', 'key': None, u'database_api_version': u'1.0', u'metering_api_version': u'2', 'auth_url': 'http://192.0.9.77:5000/v3', u'network_api_version': u'2', u'message': u'', u'image_format': u'qcow2', 'networks': [], 'queues_api_version': '2', 'clustering_api_version': '1', 'verify': True, u'dns_api_version': '2', u'object_store_api_version': u'1', 'username': 'admin', u'container_infra_api_version': u'1', 'verbose_level': 3, 'region_name': 'RegionOne', 'api_timeout': None, u'baremetal_api_version': '1.9', u'image_api_version': u'2', 'auth': {'project_name': 'admin', 'user_domain_id': 'default', 'project_domain_id': 'default'}, 'default_domain': 'default', u'container_api_version': u'1', u'image_api_use_tasks': False, u'floating_ip_source': u'neutron', u'orchestration_api_version': '1', 'timing': False, 'password': '***', u'application_catalog_api_version': u'1', 'cacert': None, u'key_manager_api_version': '1', u'workflow_api_version': u'2', 'deferred_help': False, u'identity_api_version': '3', u'volume_api_version': '2', 'cert': None, u'secgroup_source': u'neutron', u'status': u'active', 'debug': True, u'interface': None, u'disable_vendor_agent': {}}
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/osc_lib/shell.py", line 135, in run
    ret_val = super(OpenStackShell, self).run(argv)
  File "/usr/local/lib/python2.7/dist-packages/cliff/app.py", line 279, in run
    result = self.run_subcommand(remainder)
  File "/usr/local/lib/python2.7/dist-packages/osc_lib/shell.py", line 180, in run_subcommand
    ret_value = super(OpenStackShell, self).run_subcommand(argv)
  File "/usr/local/lib/python2.7/dist-packages/cliff/app.py", line 363, in run_subcommand
    subcommand = self.command_manager.find_command(argv)
  File "/usr/local/lib/python2.7/dist-packages/cliff/commandmanager.py", line 83, in find_command
    cmd_factory = cmd_ep.resolve()
  File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2297, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
ImportError: No module named Service