Hi all, I'm trying to deploy overcloud (liberty stable version) and always get this error: May 24 10:01:25 overcloud-novacompute-0 systemd[1]: openstack-nova-compute.service: main process exited, code=exited, status=1/FAILURE May 24 10:01:25 overcloud-novacompute-0 systemd[1]: Failed to start OpenStack Nova Compute Server. May 24 10:01:25 overcloud-novacompute-0 systemd[1]: Unit openstack-nova-compute.service entered failed state. May 24 10:01:25 overcloud-novacompute-0 systemd[1]: openstack-nova-compute.service failed. May 24 10:01:25 overcloud-novacompute-0 systemd[1]: openstack-nova-compute.service holdoff time over, scheduling restart. May 24 10:01:25 overcloud-novacompute-0 systemd[1]: Starting OpenStack Nova Compute Server... May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: No handlers could be found for logger "oslo_config.cfg" May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: Traceback (most recent call last): May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/bin/nova-compute", line 10, in <module> May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: sys.exit(main()) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/nova/cmd/compute.py", line 58, in main May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: config.parse_args(sys.argv) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/nova/config.py", line 60, in parse_args May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: rpc.init(CONF) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/nova/rpc.py", line 63, in init May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: aliases=TRANSPORT_ALIASES) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 186, in get_transport May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: invoke_kwds=kwargs) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/stevedore/driver.py", line 45, in __init__ May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: verify_requirements=verify_requirements, May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/stevedore/named.py", line 55, in __init__ May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: verify_requirements) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 170, in _load_plugins May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: self._on_load_failure_callback(self, ep, err) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 162, in _load_plugins May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: verify_requirements, May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/stevedore/named.py", line 123, in _load_one_plugin May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: verify_requirements, May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 185, in _load_one_plugin May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: plugin = ep.load(require=verify_requirements) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: entry = __import__(self.module_name, globals(),globals(), ['__name__']) May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py", line 101, in <module> May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: cfg.PortOpt('rabbit_port', May 24 10:01:27 overcloud-novacompute-0 nova-compute[17544]: AttributeError: 'module' object has no attribute 'PortOpt' Any hint? Thanks