celery tutorial: NotRegistered error

Question

I'm trying to get celery's official tutorial work but kept getting this error:

D:\test>celery -A tasks worker --loglevel=info
-------------- celery@BLR122S v3.0.17 (Chiastic Slide)
---- **** -----
--- * * * -- [Configuration]
-- * - **** --- . broker: amqp://guest@localhost:5672//
- ** ---------- . app: tasks:0x2a76850
- ** ---------- . concurrency: 2 (processes)
- ** ---------- . events: OFF (enable -E to monitor this worker)
- ** ----------
- * --- * --- [Queues]
-- ******* ---- . celery: exchange:celery(direct) binding:celery
--- ***** -----
[Tasks]
. tasks.add
[2013-03-29 17:50:52,533: WARNING/MainProcess] celery@BLR122S ready.
[2013-03-29 17:50:52,568: INFO/MainProcess] consumer: Connected to amqp://guest@ 127.0.0.1:5672//.
[2013-03-29 17:51:32,496: INFO/MainProcess] Got task from broker: tasks.add[8345 9233-ce54-40ed-a2a8-ee0d60768006]
[2013-03-29 17:51:32,562: ERROR/MainProcess] Task tasks.add[83459233-ce54-40ed-a 2a8-ee0d60768006] raised exception: Task of kind 'tasks.add' is not registered, please make sure it's imported.
Traceback (most recent call last):

File "C:\Python27\lib\site-packages\billiard\pool.py", line 293, in worker

result = (True, func(*args, **kwds))
File "C:\Python27\lib\site-packages\celery\task\trace.py", line 320, in _fast_trace_task
return _tasks[task].__trace__(uuid, args, kwargs, request)[0]
File "C:\Python27\lib\site-packages\celery\app\registry.py", line 20, in __missing__
raise self.NotRegistered(key)
NotRegistered: 'tasks.add'

I installed celery==3.0.17 and rabbitMQ.
Then start celery by "D:\test>celery -A tasks worker --loglevel=info"
tasks.add seems to be in [Tasks], but calling by:

>>> from tasks import add
>>> add.delay(1,1)
# Out: AsyncResult: 83459233-ce54-40ed-a2a8-ee0d60768006

got the failure above. Does anyone have the same problem?

Edit: Here is my tasks.py copying from tutorial.

from celery import Celery

celery = Celery('tasks', broker='amqp://guest@localhost//')

@celery.task
def add(x, y):
    return x + y

Answer 1

Following Will solve your Problem

from tasks import add
res = add.delay(1,2) #call to add 
res.get() #get result

Restart your worker after changes using

celery -A tasks worker --loglevel=info