packstack: ERROR : 'module' object has no attribute 'publish_doctree'

[root@node-4 ~]# uname -a
Linux node-4 3.10.0-514.2.2.el7.x86_64 #1 SMP Tue Dec 6 23:06:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[root@node-4 ~]# rpm -qa|grep packstack
openstack-packstack-puppet-9.0.0-1.el7.noarch
openstack-packstack-9.0.0-1.el7.noarch
[root@node-4 ~]# packstack --gen-answer-file=answers.txt
ERROR:root:Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 950, in main
    initPluginsConfig()
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 927, in initPluginsConfig
    plugin.initConfig(controller)
  File "/usr/lib/python2.7/site-packages/packstack/plugins/prescript_000.py", line 842, in initConfig
    update_params_usage(basedefs.PACKSTACK_DOC, params)
  File "/usr/lib/python2.7/site-packages/packstack/modules/documentation.py", line 73, in update_params_usage
    tree = core.publish_doctree(
AttributeError: 'module' object has no attribute 'publish_doctree'

ERROR : 'module' object has no attribute 'publish_doctree'
Traceback (most recent call last):
  File "/usr/bin/packstack", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 1020, in main
    print(output_messages.ERR_CHECK_LOG_FILE_FOR_MORE_INFO % (logFile))
UnboundLocalError: local variable 'logFile' referenced before assignment