Почему сельдерей возвращает ошибку KeyError при выполнении моей задачи?

Я продолжаю получать эту keyError. Я отправляю строки и id (целые числа) в функцию задачи, поэтому не думаю, что это проблема сериализации. Также он говорит, что ошибка ключа находится на пути к самой функции, а не к ее содержимому. Пожалуйста помоги.

Tasks.py

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,
                       })

Соответствующие настройки

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 = "/"

Вывод сельдерея:

[Задачи]

  . 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