Celeryd with django

Question

I've been trying to run a celeryd (celery 3.1.25) service for my django project, but when I define

CELERYD_USER="www-data"
CELERYD_GROUP="www-data"

in /etc/default/celeryd which seems to be used a lot, I get the following:

celery init v10.1.
Using config script: /etc/default/celeryd
This account is currently not available.

which of course has to do with the www-data user. If I change the user to, say, "celery", I get a permission denied error on a log file owned by www-data.

Really frustrated...