AttributeError: 'NoneType' object has no attribute 'Redis' when using Celery with Redis

[jamesjohnson1025]

I'm encountering an error when trying to use Celery with Redis in my Python project. Despite having installed both Celery and Redis, I'm getting the following error:

    class PrefixedStrictRedis(GlobalKeyPrefixMixin, redis.Redis):
AttributeError: 'NoneType' object has no attribute 'Redis'

This error occurs in the Kombu library, which is a dependency of Celery. I've already tried the following steps:

Installed Redis: pip install redis
Installed Celery: pip install celery

Verified that the Redis server is running
I checked that I am using the correct virtual environment

My environment:

Python version: 3.10
Operating System: macOS
Redis: 4.5.2
Celery: 5.4.0

I am using Redis docker. I tried testing using the below script and it returned true:

import redis

r = redis.Redis(host='localhost', port=6379, db=0)

try:
    r.ping()
    print("Successfully connected to Redis")
except redis.ConnectionError:
    print("Failed to connect to Redis")

What could be causing this error, and how can I resolve it? Is there a potential version conflict or misconfiguration that I'm overlooking?

The error is triggered when I try to execute the following train function using my FastAPI endpoint:

# api.py
api.post("/train")
def train():
    hello.delay()

# tasks.py
celery_app = Celery('tasks', broker='redis://localhost:6379/0')
celery_app.conf.update(result_backend='redis://localhost:6379/0')

@celery_app.task
def hello():
   print("Hello world")

[swcasimiro]

pip install redis

[SandeepaDevin]

I have the same issue, but I configured celery with supervisor. It works well in any manual configuration.