Enable to start nova

[vivekkhurana]

I am enable to start nova-network. On start nova-network , nova-network.log shows following error

CRITICAL nova [-] Unexpected error while running command.
Command: sudo nova iptables-save -t filter
Exit code: 2
Stdout: ''
Stderr: "usage: nova [--debug] [--os_username OS_USERNAME] [--os_password OS_PASSWORD]\n [--os_tenant_name OS_TENANT_NAME] [--os_auth_url OS_AUTH_URL]\n [--os_region_name OS_REGION_NAME] [--service_type SERVICE_TYPE]\n [--service_name SERVICE_NAME] [--endpoint_type ENDPOINT_TYPE]\n [--version VERSION] [--username USERNAME]\n [--region_name REGION_NAME] [--apikey APIKEY]\n [--projectid PROJECTID] [--url URL]\n <subcommand> ...\nerror: argument <subcommand>: invalid choice: 'iptables-save'\nTry `nova' for more information.\n"

nova-network service fails to start.