i am having an issue with keystone,keystone is configured with users nova,glance and admin user and their endpoints are also defined. when performing

keystone token-get 

it is showing token,but for commands like

keystone user-list

its showing

No handlers could be found for logger "keystoneclient.client"
Unable to communicate with identity service: 404 Not Found
The resource could not be found.
 . (HTTP 404)

but after setting these env variables it worked

export SERVICE_ENDPOINT=http://192.168.10.15:35357/v2.0
export SERVICE_TOKEN=token

but after that for keystone token-get its showing

'Client' object has no attribute 'service_catalog'

Why is it so?How can it be fixed any ideas