cloudkitty error log

2018-12-04 14:52:27.492 6412 CRITICAL cloudkitty [-] Unhandled error: voluptuous.error.MultipleInvalid: expected a dictionary
2018-12-04 14:52:27.492 6412 ERROR cloudkitty Traceback (most recent call last):
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/voluptuous/schema_builder.py", line 267, in __call__
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     return self._compiled([], data)
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/voluptuous/schema_builder.py", line 555, in validate_dict
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     raise er.DictInvalid('expected a dictionary', path)
2018-12-04 14:52:27.492 6412 ERROR cloudkitty voluptuous.error.DictInvalid: expected a dictionary
2018-12-04 14:52:27.492 6412 ERROR cloudkitty
2018-12-04 14:52:27.492 6412 ERROR cloudkitty During handling of the above exception, another exception occurred:
2018-12-04 14:52:27.492 6412 ERROR cloudkitty
2018-12-04 14:52:27.492 6412 ERROR cloudkitty Traceback (most recent call last):
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/bin/cloudkitty-processor", line 10, in <module>
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     sys.exit(main())
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/cloudkitty/cli/processor.py", line 30, in main
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     processor = orchestrator.Orchestrator()
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/cloudkitty/orchestrator.py", line 248, in __init__
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     self.collector = collector.get_collector(transformers)
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/cloudkitty/collector/__init__.py", line 114, in get_collector
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     invoke_kwds=collector_args).driver
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/stevedore/driver.py", line 61, in __init__
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     warn_on_missing_entrypoint=warn_on_missing_entrypoint
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/stevedore/named.py", line 81, in __init__
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     verify_requirements)
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/stevedore/extension.py", line 203, in _load_plugins
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     self._on_load_failure_callback(self, ep, err)
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/stevedore/extension.py", line 195, in _load_plugins
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     verify_requirements,
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/stevedore/named.py", line 158, in _load_one_plugin
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     verify_requirements,
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/stevedore/extension.py", line 227, in _load_one_plugin
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     obj = plugin(*invoke_args, **invoke_kwds)
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/cloudkitty/collector/gnocchi.py", line 105, in __init__
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     super(GnocchiCollector, self).__init__(transformers, **kwargs)
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/cloudkitty/collector/__init__.py", line 179, in __init__
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     self.conf = self.check_configuration(kwargs['conf'])
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/cloudkitty/collector/gnocchi.py", line 138, in check_configuration
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     conf = Schema(collector.CONF_BASE_SCHEMA)(conf)
2018-12-04 14:52:27.492 6412 ERROR cloudkitty   File "/usr/lib/python3.6/site-packages/voluptuous/schema_builder.py", line 271, in __call__
2018-12-04 14:52:27.492 6412 ERROR cloudkitty     raise er.MultipleInvalid([e])
2018-12-04 14:52:27.492 6412 ERROR cloudkitty voluptuous.error.MultipleInvalid: expected a dictionary