Comment 1 for bug 1715808

The error is caused by using a newer version of python-zunclient with older version of Zun server. I guess the error will disappear by pulling down the latest version of Zun server. In particular, make sure your Zun server have this commit: https://github.com/openstack/zun/commit/b6a8b36b1d6ca2b7642c5d5a5c5435017f40e8b7 .