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openstack An unexpected error prevented the server from fulfilling your request. (HTTP 500)

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2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi Traceback (most recent call last):
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/keystone/common/wsgi.py", line 239, in __call__
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     result = method(context, **params)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/keystone/token/controllers.py", line 145, in authenticate
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     auth_token_data, roles_ref=roles_ref, catalog_ref=catalog_ref)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/keystone/token/provider.py", line 333, in issue_v2_token
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     self._create_token(token_id, data)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/keystone/token/provider.py", line 190, in _create_token
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     self._persistence.get_token(token_id)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/keystone/token/provider.py", line 164, in _persistence
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     self._persistence_manager = persistence.PersistenceManager()
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/keystone/common/dependency.py", line 193, in wrapper
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     self.__wrapped_init__(*args, **kwargs)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/keystone/token/persistence/core.py", line 50, in __init__
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     super(PersistenceManager, self).__init__(CONF.token.driver)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/keystone/common/manager.py", line 70, in __init__
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     self.driver = importutils.import_object(driver_name)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/oslo_utils/importutils.py", line 38, in import_object
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     return import_class(import_str)(*args, **kwargs)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi   File "/usr/lib/python2.7/site-packages/oslo_utils/importutils.py", line 27, in import_class
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi     __import__(mod_str)
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi ImportError: No module named memchache
2016-01-10 08:09:24.562 18048 TRACE keystone.common.wsgi

I am getting this error while executing this command

openstack --os-auth-url http://controller:35357 \ --os-project-name admin --os-username admin --os-auth-type password \ token issue