error that I get when I run worker

error.msg

11:15:10 RQ worker u'rq:worker:SH-MBP.9665' started, version 0.5.6
11:15:10
11:15:10 *** Listening on default...
11:15:20 default: send_out_appt_confirmation_sms_queue('(V(000)457-0000\np0\nc__builtin__\nset\np1\n((lp2\nL4044L\natp3\nRp4\ntp5\n.') (2525c7d3-d8e5-407c-9679-f2839a0dd245)
---------------------------------------------------------------------------
UnpickleError                             Traceback (most recent call last)
/Users/zt9/code/pr2/myapp/worker.py in <module>()
     21 ipdb.set_trace()
---> 23 if __name__ == '__main__':
     24     with Connection(conn):
     25         worker = Worker(map(Queue, listen))

/Users/zt9/.virtualenvs/pr2/lib/python2.7/site-packages/rq/worker.pyc in work(self, burst)
    429
    430                 job, queue = result
--> 431                 self.execute_job(job)
    432                 self.heartbeat()
    433

/Users/zt9/.virtualenvs/pr2/lib/python2.7/site-packages/rq/worker.pyc in execute_job(self, job)
    494         child_pid = os.fork()
    495         if child_pid == 0:
--> 496             self.main_work_horse(job)
    497         else:
    498             self._horse_pid = child_pid

/Users/zt9/.virtualenvs/pr2/lib/python2.7/site-packages/rq/worker.pyc in main_work_horse(self, job)
    531         self.log = logger
    532
--> 533         success = self.perform_job(job)
    534
    535         # os._exit() is the way to exit from childs after a fork(), in

/Users/zt9/.virtualenvs/pr2/lib/python2.7/site-packages/rq/worker.pyc in perform_job(self, job)
    559         inside the work horse's process.
    560         """
--> 561         self.prepare_job_execution(job)
    562
    563         with self.connection._pipeline() as pipeline:

/Users/zt9/.virtualenvs/pr2/lib/python2.7/site-packages/rq/worker.pyc in prepare_job_execution(self, job)
    553
    554         msg = 'Processing {0} from {1} since {2}'
--> 555         self.procline(msg.format(job.func_name, job.origin, time.time()))
    556
    557     def perform_job(self, job):

/Users/zt9/.virtualenvs/pr2/lib/python2.7/site-packages/rq/job.pyc in func_name(self)
    239     def func_name(self):
    240         if self._func_name is UNEVALUATED:
--> 241             self._unpickle_data()
    242         return self._func_name
    243

/Users/zt9/.virtualenvs/pr2/lib/python2.7/site-packages/rq/job.pyc in _unpickle_data(self)
    207
    208     def _unpickle_data(self):
--> 209         self._func_name, self._instance, self._args, self._kwargs = unpickle(self.data)
    210
    211     @property

/Users/zt9/.virtualenvs/pr2/lib/python2.7/site-packages/rq/job.pyc in unpickle(pickled_string)
     51         obj = loads(pickled_string)
     52     except Exception as e:
---> 53         raise UnpickleError('Could not unpickle', pickled_string, e)
     54     return obj
     55
UnpickleError: (u'Could not unpickle', ImportError('cannot import name SmsRecord',))