celery 多 worker 时在 run 中出现 no module named 错误

# coding=utf-8
import time
from manage import app
from celery.contrib.methods import task_method


class HelloService(object):
    @app.task(filter=task_method)
    def say(self):
        time.sleep(4)
        print('hello!')

# coding=utf-8
import time
from celery.contrib.methods import task_method
from manage import app


class WorldService(object):
    @app.task(filter=task_method)
    def say(self):
        time.sleep(4)
        print('hello')

# coding=utf-8
from hello import HelloService
from world import WorldService

if __name__ == '__main__':
    HelloService().say.delay()
    WorldService().say.delay()
    print('process done')

celery worker -A hello --loglevel=INFO -n hello
celery worker -A world --loglevel=INFO -n world