[Python] Problema com Celery e Django/Python

Estou tentando implementar um sistema de tasks com Celery no Django, mas está dando erro e eu não sei como resolver...

Erro que aparece no console:



tasks.py

from __future__ import absolute_import, unicode_literals
from celery import task

from datetime import date



@task(ignore_result=True)
def verify_post_date(string):
print(string)


settings.py

from celery.schedules import crontab
from datetime import timedelta


CELERY_ALWAYS_EAGER = True
CELERY_BROKER_URL = 'redis://localhost:6379/0'
#CELERY_RESULT_BACKEND = 'redis://localhost:6379/0'
CELERY_ACCEPT_CONTENT = ['application/json']
CELERY_RESULT_SERIALIZER = 'json'
CELERY_TASK_SERIALIZER = 'json'
CELERY_TIMEZONE = 'America/Sao_Paulo'
CELERY_BEAT_SCHEDULE = {

'verify_post_date': {
'task': 'core.verify_post_date',
'schedule': timedelta(seconds=10),

},

}

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