After configured internal, subnet and router unable to get the namespace using " ip netns list ", it doesn't show any output.

In openvswitch log message getting this error :

      system@ovs-system: failed to add gre-1 as port: Address family not supported by protocol.

3 node setup, Controller node (keystone, cinder, glance, rabbitmqserver, horizon and nova), Compute node (nova compute) and Neutron network node.