Django Celery Persistent revoke

So I have a project in Django that uses Celery and sometimes I am revoking tasks.

Celery has the ability to persist revokes even if the worker is restarted (http://docs.celeryproject.org/en/latest/userguide/workers.html#worker-persistent-revokes)

However when following the docs I get this error:

anydbm.error: db type could not be determined

I have tried copying the code from the docs, pointing it to my own db I made using:

sqlite3 worker.db

But I can't seem to work it out...

I'd love some help, thanks!