Error in reloading the post object from database

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I have setup Celery to send notifications asynchronously.

In send_instant_notifications_about_activity_in_post Post object is reloaded and got this error.

2014-05-24 22:35:47,659: ERROR/MainProcess] Task askbot.tasks.send_instant_notifications_about_activity_in_post[3c31870b-14f0-4d9a-9429-6c8040f5426d] raised unexpected: DoesNotExist("Post matching query does not exist. Lookup parameters were {'id': 8}",) Traceback (most recent call last):

File "/home/ubuntu/.virtualenvs/lawayo/local/lib/python2.7/site-packages/celery/app/trace.py", line 240, in trace_task R = retval = fun(args, *kwargs)

File "/home/ubuntu/.virtualenvs/lawayo/local/lib/python2.7/site-packages/celery/app/trace.py", line 437, in __protected_call__ return self.run(args, *kwargs)

File "/home/ubuntu/public_html/lawayo.com/lawayo/askbot/tasks.py", line 216, in send_instant_notifications_about_activity_in_post post = Post.objects.get(id=post.id)

File "/home/ubuntu/.virtualenvs/lawayo/local/lib/python2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/manager.py", line 143, in get return self.get_query_set().get(args, *kwargs)

File "/home/ubuntu/.virtualenvs/lawayo/local/lib/python2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/query.py", line 401, in get (self.model._meta.object_name, kwargs))

Exception: Post matching query does not exist. Lookup parameters were {'id': 8

ID is being retrieved from the object itself just to reload the object, still fetch failed. Please help.