Redis not working. __init__() got an unexpected keyword argument 'username'

i am trying to run the celery -A project worker -l info. But each time it returns an error like init got unexpected error. Kindly Help.
Thanks in advance.

my settings file:

CELERY_BROKER_URL = 'redis://localhost:6379'
CELERY_RESULT_BACKEND = 'redis://localhost:6379'
CELERY_ACCEPT_CONTENT = ['application/json']
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'
CELERY_TIMEZONE = 'Africa/Nairobi'

celery file:

from __future__ import absolute_import, unicode_literals
import os
from celery import Celery

# setting the Django settings module.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'project.settings')
app = Celery('project')
app.config_from_object('django.conf:settings', namespace='CELERY')

# Looks up for task modules in Django applications and loads them
app.autodiscover_tasks()


@app.task(bind=True)
def debug_task():
    print('Request')

init file

from __future__ import absolute_import

# This will make sure the app is always imported when
# Django starts so that shared_task will use this app.
from .celery import app as celery_app