NOC Schedular Error

START OF TRACEBACK
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File: /usr/lib/python2.7/site-packages/pymongo/collection.py (Line: 359)
Function: insert
  352             if manipulate:
  353                 docs = [self.__database._fix_incoming(doc, self) for doc in docs]
  354
  355             safe, options = self._get_write_mode(safe, **kwargs)
  356             self.__database.connection._send_message(
  357                 message.insert(self.__full_name, docs,
  358                                check_keys, safe, options,
  359 ==>                            continue_on_error, self.__uuid_subtype), safe)
  360
  361             ids = [doc.get("_id", None) for doc in docs]
  362             return return_one and ids[0] or ids
  363
  364         def update(self, spec, document, upsert=False, manipulate=False,
  365                    safe=None, multi=False, check_keys=True, **kwargs):
Variables:
                safe = False
          check_keys = True
                docs = []
          return_one = False
                self = Collection(Database(Connection('localhost', 27017), u'noc'), u'noc.cache.selector.tmp')
              kwargs = {}
   continue_on_error = False
         doc_or_docs = []
             options = {}
          manipulate = True
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File: /opt/noc/sa/jobs/refresh_selector_cache.py (Line: 47)
Function: handler
   40                             "vc_domain": vcd_map.get(s.id)
   41                         }
   42                     ]
   43             # Write temporary cache
   44             self.info("Writing cache")
   45             tmp = self.cache + ".tmp"
   46             c = get_db()[tmp]
   47 ==>         c.insert(r)
   48             # Substitute cache
   49             c.rename(self.cache, dropTarget=True)
   50             #
   51             return True
   52
   53         @classmethod
Variables:
                 tmp = 'noc.cache.selector.tmp'
                   c = Collection(Database(Connection('localhost', 27017), u'noc'), u'noc.cache.selector.tmp')
                self = <noc.sa.jobs.refresh_selector_cache.RefreshSelectorCacheJob object at 0x7f86302c8a90>
                args = ()
                   r = []
              kwargs = {}
             vcd_map = {}
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File: /opt/noc/lib/scheduler/scheduler.py (Line: 242)
Function: _job_wrapper
  235                 t.start()
  236             else:
  237                 return self._job_wrapper(job, **kwargs)
  238
  239         def _job_wrapper(self, job, **kwargs):
  240             tb = None
  241             try:
  242 ==>             r = job.handler(**kwargs)
  243             except Exception:
  244                 error_report()
  245                 job.on_exception()
  246                 s = job.S_EXCEPTION
  247                 tb = get_traceback()
  248             else:
Variables:
                 job = <noc.sa.jobs.refresh_selector_cache.RefreshSelectorCacheJob object at 0x7f86302c8a90>
                  tb = None
                self = <noc.main.scheduler.scheduler.JobScheduler object at 0x4024410>
              kwargs = {}
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END OF TRACEBACK