os error neith

Message
    No valid host was found. There are not enough hosts available.
Code
    500
Details
    File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/nova/conductor/manager.py", line 496, in build_instances context, request_spec, filter_properties) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/nova/conductor/manager.py", line 567, in _schedule_instances hosts = self.scheduler_client.select_destinations(context, spec_obj) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/nova/scheduler/utils.py", line 370, in wrapped return func(*args, **kwargs) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 51, in select_destinations return self.queryclient.select_destinations(context, spec_obj) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 37, in __run_method return getattr(self.instance, __name)(*args, **kwargs) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/nova/scheduler/client/query.py", line 32, in select_destinations return self.scheduler_rpcapi.select_destinations(context, spec_obj) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/nova/scheduler/rpcapi.py", line 126, in select_destinations return cctxt.call(ctxt, 'select_destinations', **msg_args) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 169, in call retry=self.retry) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/oslo_messaging/transport.py", line 97, in _send timeout=timeout, retry=retry) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 464, in send retry=retry) File "/openstack/venvs/nova-14.0.1/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 455, in _send raise result
Created
    Nov. 4, 2016, 9:14 a.m.