root@server3:~# keystone-manage credentials list
ERROR: 'NoneType' object has no attribute 'name'
Traceback (most recent call last):
  File "/usr/bin/keystone-manage", line 16, in <module>
    keystone.manage.main()
  File "/usr/lib/python2.7/dist-packages/keystone/manage/__init__.py", line 286, in main
    raise exc
AttributeError: 'NoneType' object has no attribute 'name'
root@server3:~#