ceilometer-client cannot get samples by source

run following command in shell:

ceilometer sample-list -c "image" -s "openstack"

 gets HTTPInternalServerError (HTTP 500) error.

The traceback of ceilometer-api:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "/opt/stack/python-keystoneclient/keystoneclient/middleware/auth_token.py", line 298, in __call__
    return self.app(env, start_response)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/opt/stack/ceilometer/ceilometer/api/v1/blueprint.py", line 401, in list_events_by_source
    meter=meter,
  File "/opt/stack/ceilometer/ceilometer/api/v1/blueprint.py", line 338, in _list_events
    events = list(flask.request.storage_conn.get_raw_events(f))
  File "/opt/stack/ceilometer/ceilometer/storage/impl_sqlalchemy.py", line 322, in get_raw_events
    require_meter=False)
  File "/opt/stack/ceilometer/ceilometer/storage/impl_sqlalchemy.py", line 103, in make_query_from_filter
    query = query.filter_by(source=event_filter.source)
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 1211, in filter_by
    for key, value in kwargs.iteritems()]
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/util.py", line 601, in _entity_descriptor
    (description, key)
InvalidRequestError: Entity '<class 'ceilometer.storage.sqlalchemy.models.Meter'>' has no property 'source'

PS:
ceilometer-api version: 1
database_connection: mysql
there is data in the database and the source is "openstack"
no authentication error