14-06-27 16:35:02.503 1389 TRACE cinder     value = import_string(found_expr)
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 22, in import_string
2014-06-27 16:35:02.503 1389 TRACE cinder     return pkg_resources.EntryPoint.parse("x=" + s).load(False)
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1989, in load
2014-06-27 16:35:02.503 1389 TRACE cinder     entry = __import__(self.module_name, globals(),globals(), ['__name__'])
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/cinder/api/v2/router.py", line 27, in <module>
2014-06-27 16:35:02.503 1389 TRACE cinder     from cinder.api.v2 import snapshot_metadata
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/cinder/api/v2/snapshot_metadata.py", line 23, in <module>
2014-06-27 16:35:02.503 1389 TRACE cinder     from cinder import volume
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/cinder/volume/__init__.py", line 29, in <module>
2014-06-27 16:35:02.503 1389 TRACE cinder     API = import_utils.import_class(CONF.volume_api_class)
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/cinder/openstack/common/importutils.py", line 30, in import_class
2014-06-27 16:35:02.503 1389 TRACE cinder     __import__(mod_str)
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/nova/volume/__init__.py", line 32, in <module>
2014-06-27 16:35:02.503 1389 TRACE cinder     oslo.config.cfg.CONF.register_opts(_volume_opts)
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/oslo/config/cfg.py", line 1579, in __inner
2014-06-27 16:35:02.503 1389 TRACE cinder     result = f(self, *args, **kwargs)
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/oslo/config/cfg.py", line 1715, in register_opts
2014-06-27 16:35:02.503 1389 TRACE cinder     self.register_opt(opt, group, clear_cache=False)
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/oslo/config/cfg.py", line 1583, in __inner
2014-06-27 16:35:02.503 1389 TRACE cinder     return f(self, *args, **kwargs)
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/oslo/config/cfg.py", line 1704, in register_opt
2014-06-27 16:35:02.503 1389 TRACE cinder     if _is_opt_registered(self._opts, opt):
2014-06-27 16:35:02.503 1389 TRACE cinder   File "/usr/lib/python2.7/dist-packages/oslo/config/cfg.py", line 494, in _is_opt_registered
2014-06-27 16:35:02.503 1389 TRACE cinder     raise DuplicateOptError(opt.name)
2014-06-27 16:35:02.503 1389 TRACE cinder DuplicateOptError: duplicate option: volume_api_class