title: Why does celery return a KeyError when executing my task?
body: <p>I keep getting this keyError. I am sending strings and id (integers) to the task function, so I don't think it is serialization issue. Also it says the keyerror is on the path to the function itself, not the contents. Please help.</p>
  
  <p><strong>Tasks.py</strong></p>
  
  <pre><code>from celery.decorators import task
  from notification import models as notification
  
  @task(ignore_result=True)
  def notify_match_creation(match, home_team, away_team, home_team_captain, away_team_captain):
      notification.send(User.objects.filter(profile__teams__pk__in=(home_team, away_team)),
                        "tournaments_new_match",
                        {'match': unicode(match),
                         'home_team_captain': home_team_captain,
                         'away_team_captain': away_team_captain,
                         })
  </code></pre>
  
  <p><strong>Relevant settings</strong></p>
  
  <pre><code>CELERY_RESULT_BACKEND = "database"
  CELERY_RESULT_DBURI = "postgresql://user:pass@localhost/ahgl"
  BROKER_HOST = "localhost"
  BROKER_PORT = 5672
  BROKER_USER = "guest"
  BROKER_PASSWORD = "guest"
  BROKER_VHOST = "/"
  </code></pre>
  
  <p><strong>Celery output:</strong></p>
  
  <p>[Tasks]</p>
  
  <pre><code>  . apps.tournaments.tasks.notify_match_creation
    . tournaments.tasks.notify_match_creation
  [2012-02-25 02:34:06,209: WARNING/MainProcess] celery@NATTOWER has started.
  [2012-02-25 02:34:06,477: WARNING/PoolWorker-4] E:\Webdesign\ahgl\ENV\lib\site-packages\djcelery\loaders.py:84: UserWarn
  ing: Using settings.DEBUG leads to a memory leak, never use this setting in production environments!
    warnings.warn("Using settings.DEBUG leads to a memory leak, never "
  [2012-02-25 02:34:06,479: WARNING/PoolWorker-2] E:\Webdesign\ahgl\ENV\lib\site-packages\djcelery\loaders.py:84: UserWarn
  ing: Using settings.DEBUG leads to a memory leak, never use this setting in production environments!
    warnings.warn("Using settings.DEBUG leads to a memory leak, never "
  [2012-02-25 02:34:06,523: WARNING/PoolWorker-3] E:\Webdesign\ahgl\ENV\lib\site-packages\djcelery\loaders.py:84: UserWarn
  ing: Using settings.DEBUG leads to a memory leak, never use this setting in production environments!
    warnings.warn("Using settings.DEBUG leads to a memory leak, never "
  [2012-02-25 02:34:06,566: WARNING/PoolWorker-1] E:\Webdesign\ahgl\ENV\lib\site-packages\djcelery\loaders.py:84: UserWarn
  ing: Using settings.DEBUG leads to a memory leak, never use this setting in production environments!
    warnings.warn("Using settings.DEBUG leads to a memory leak, never "
  [2012-02-25 02:34:31,520: INFO/MainProcess] Got task from broker: apps.tournaments.tasks.notify_match_creation[4dbd6258-
  5cee-49e9-8c8a-2d2105a2d52a]
  [2012-02-25 02:34:31,569: ERROR/MainProcess] Task apps.tournaments.tasks.notify_match_creation[4dbd6258-5cee-49e9-8c8a-2
  d2105a2d52a] raised exception: KeyError('apps.tournaments.tasks.notify_match_creation',)
  Traceback (most recent call last):
    File "E:\Webdesign\ahgl\ENV\lib\site-packages\celery\concurrency\processes\pool.py", line 211, in worker
      result = (True, func(*args, **kwds))
    File "E:\Webdesign\ahgl\ENV\lib\site-packages\celery\worker\job.py", line 50, in execute_and_trace
      task = tasks[name]
  KeyError: 'apps.tournaments.tasks.notify_match_creation'
  [2012-02-25 02:38:29,773: WARNING/MainProcess] celeryd: Hitting Ctrl+C again will terminate all running tasks!
  [2012-02-25 02:38:29,773: WARNING/MainProcess] celeryd: Warm shutdown (MainProcess)
  [2012-02-25 02:38:31,779: INFO/MainProcess] process shutting down
  </code></pre>