error when running - admin-role-manage with switch --get-roles

Execute the following command:

root@node1-cb450-ubuntu14:/opt/couchbase/bin# ./couchbase-cli admin-role-manage --cluster=localhost -u Administrator -p password --get-roles

DEPRECATED: Please use the user-manage command instead

Traceback (most recent call last):

  File "/opt/couchbase/lib/python/couchbase-cli", line 20, in <module>

    main()

  File "/opt/couchbase/lib/python/couchbase-cli", line 15, in main

    cli.execute(args)

  File "/opt/couchbase/lib/python/cbmgr.py", line 336, in execute

    opts.klass().execute(opts)

  File "/opt/couchbase/lib/python/cbmgr.py", line 461, in execute

    data, errors = rest.get_roles()

AttributeError: 'ClusterManager' object has no attribute 'get_roles'

Even though admin-role-manage is deprecated, there should not be any error in command execution.