Celery: ValueError: not enough values to unpack (expected 3, got 0)

Checklist

system info

software -> celery:4.1.0 (latentcall) kombu:4.1.0 py:3.6.2
billiard:3.5.0.3 py-amqp:2.2.1
platform -> system:Windows arch:32bit, WindowsPE imp:CPython
loader -> celery.loaders.app.AppLoader
settings -> transport:pyamqp results:redis
broker_url: 'amqp://guest:*@...:5672//'
result_backend: 'redis://:*@...*/0' I try sqlite and remove backend too, but not working

• [x] I have included the output of celery -A proj report in the issue.
  (if you are not able to do this, then at least specify the Celery
  version affected).
• [x] I have verified that the issue exists against the master branch of Celery.

Steps to reproduce

I follow the tutorial which on official website to run task.py in my win10,
but get error

Expected behavior

print success

Actual behavior

I name the file tasks.py to mytask.pl, so I try to run in

celery -A mytask worker -l info

It connecting OK.

BUT when I try to run the test add.delay(2,2) example , I get the error below:

[2017-08-02 19:59:04,777: ERROR/MainProcess] Task handler raised error: ValueError('not enough values to unpack (expected 3, got 0)',)
Traceback (most recent call last):
File "d:\python\python36-32\lib\site-packages\billiard\pool.py", line 358, in workloop
result = (True, prepare_result(fun(args, *kwargs)))
File "d:\python\python36-32\lib\site-packages\celery\app\trace.py", line 525, in _fast_trace_task
tasks, accept, hostname = _loc
ValueError: not enough values to unpack (expected 3, got 0)
[2017-08-02 20:04:30,870: INFO/MainProcess] Received task: mytask.hello[ec84d3ba-98ac-44bc-be5e-09190c2712e0]
[2017-08-02 20:04:30,873: ERROR/MainProcess] Task handler raised error: ValueError('not enough values to unpack (expected 3, got 0)',)
Traceback (most recent call last):
File "d:\python\python36-32\lib\site-packages\billiard\pool.py", line 358, in workloop
result = (True, prepare_result(fun(args, *kwargs)))
File "d:\python\python36-32\lib\site-packages\celery\app\trace.py", line 525, in _fast_trace_task
tasks, accept, hostname = _loc
ValueError: not enough values to unpack (expected 3, got 0)

My Solution

Try to uninstall celery 4.1.0 and replace to 3.1.24

pip uninstall celery
pip install celery==3.1.24

Than It Work Fine For Me ! Everything is OK! I think this information is useful to you

This version report:

software -> celery:3.1.24 (Cipater) kombu:3.0.37 py:3.6.2
billiard:3.3.0.23 py-amqp:1.4.9
platform -> system:Windows (Win10) arch:32bit, WindowsPE imp:CPython
loader -> celery.loaders.app.AppLoader
settings -> transport:pyamqp results:redis://:@**/0

Why 3.1.24 ?

It's my guess , Just looking for a lower version than 4