[Answer]-Python celery multi unregistred task

The problem was solved with two steps:

1) Correct run string for celery multi was celery multi start 2 -Q:1 messages1 -Q:2 messages2 --loglevel=DEBUG -A myapp

2) I forgot to import my app in the __init__.py:

`from __future__ import absolute_import
from myapp.celery_app import celery_app as celery_app`

And this link from the log message is realy useful. http://docs.celeryq.org/en/latest/userguide/tasks.html#task-names