I installed Celery (latest stable version.)
I have a directory called /home/myuser/fable/jobs. Inside this directory, I have a file called tasks.py:
See Automatic Naming and Relative Imports, in the docs:
http://celeryq.org/docs/userguide/tasks.html#automatic-naming-and-relative-imports
The tasks name is "tasks.Submitter" (as listed in the celeryd output), but you import the task as "fable.jobs.tasks.Submitter"
I guess the best solution here is if the worker also sees it as "fable.jobs.tasks.Submitter", it makes more sense from an app perspective.
CELERY_IMPORTS = ("fable.jobs.tasks", )