the role 'create_container_host_group' was not found

[caowei]

# ansible-playbook -e orchestrator=openstack -i inventory/ playbooks/contrail_destroy.yml
 [WARNING]: Found both group and host with same name: localhost

ERROR! the role 'create_container_host_group' was not found in /root/contrail-ansible-deployer/playbooks/roles:/root/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles:/root/contrail-ansible-deployer/playbooks

The error appears to have been in '/root/contrail-ansible-deployer/playbooks/contrail_destroy.yml': line 20, column 7, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

  roles:
    - name: Generate container_host group
      ^ here