I have this in my /var/log/celery/w1.log

I'm following the steps for Celery here.

I have this in my celery.py

from __future__ import absolute_import, unicode_literals

import os

from celery import Celery

# Set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'sample.settings')

app = Celery('sample2',
            broker='amqp://',
            include=['sample2.tasks'])

# Using a string here means the worker doesn't have to serialize
# the configuration object to child processes.
# - namespace='CELERY' means all celery-related configuration keys
#   should have a `CELERY_` prefix. 
app.config_from_object('django.conf:settings', namespace='CELERY')

if __name__ == '__main__':
    app.start()

what can I do to fix this? Thanks in advance.