{"result": "Failed to run action [action_ex_id=None, action_cls='<class 'mistral.actions.action_factory.NovaAction'>', attributes='{u'client_method_name': u'servers.list'}', params='{u'detailed': True, u'sort_dirs': None, u'limit': None, u'marker': None, u'sort_keys': None, u'search_opts': u\"{'all_tenants': 1 }\"}']\n NovaAction.servers.list failed: <type 'exceptions.AttributeError'>: 'unicode' object has no attribute 'iteritems'"}