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No valid host was found. There are not enough hosts available.

Hi I am trying to lauch an instance I am getting this error :

Message No valid host was found. There are not enough hosts available. Code 500

It is a network issue or something else

Neutron openvswitch agent log :

2016-04-14 07:42:43.284 4455 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 296, in get 2016-04-14 07:42:43.284 4455 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent 'to message ID %s' % msg_id) 2016-04-14 07:42:43.284 4455 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent MessagingTimeout: Timed out waiting for a reply to message ID 396bdfdee52d4b8c9afd4d93860670d9 2016-04-14 07:42:43.284 4455 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent

nova-compute

nova.compute.manager [req-0ec65bac-8c1d-416c-bdd8-3d0e719346eb c6a9d029603b48a8818e89ac01235fdc 87894c5d3b7e433783b59136493dba4a - - -] [instance: 975dc115-5e30-421a-800d-752fbc36a9d3] Instance failed to spawn 2016-04-14 08:00:15.585 8543 ERROR nova.compute.manager [instance: 975dc115-5e30-421a-800d-752fbc36a9d3] Traceback (most recent call last): 2016-04-14 08:00:15.585 8543 ERROR nova.compute.manager [instance: 975dc115-5e30-421a-800d-752fbc36a9d3] File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2157, in _build_resources 2016-04-14 08:00:15.585 8543 ERROR nova.compute.manager [instance: 975dc115-5e30-421a-800d-752fbc36a9d3] yield resources