autodiscover_tasks error when starting worker

[pcompassion]

someone posted the same problem in SO.

http://stackoverflow.com/questions/20052885/django-celery-autodiscover-tasks-error-nonetype-object-not-iterable#comment31840587_20052885

Traceback (most recent call last):
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/supervisor/loggers.py", line 81, in emit
self.stream.write(msg)
IOError: [Errno 4] Interrupted system call
2014-01-16 14:34:43,186 DEBG fd 14 closed, stopped monitoring <POutputDispatcher at 67732904 for <Subprocess at 67100896 with name celerybeat-zibann in state STARTING> (stdout)>
2014-01-16 14:34:43,187 INFO exited: celerybeat-zibann (exit status 1; not expected)
2014-01-16 14:34:43,187 DEBG received SIGCLD indicating a child quit
2014-01-16 14:34:43,187 DEBG 'celery-zibann' stdout output:
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/djcelery/management/commands/celery.py", line 22, in run_from_argv
['{0[0]} {0[1]}'.format(argv)] + argv[2:],
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/bin/celery.py", line 723, in execute_from_commandline
super(CeleryCommand, self).execute_from_commandline(argv)))
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/bin/base.py", line 303, in execute_from_commandline
return self.handle_argv(self.prog_name, argv[1:])
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/bin/celery.py", line 715, in handle_argv
return self.execute(command, argv)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/bin/celery.py", line 669, in execute
).run_from_argv(self.prog_name, argv[1:], command=argv[0])
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/bin/worker.py", line 175, in run_from_argv
return self(_args, *_options)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/bin/base.py", line 266, in call
ret = self.run(_args, *_kwargs)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/bin/worker.py", line 208, in run
state_db=self.node_format(state_db, hostname), *_kwargs
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/worker/init.py", line 95, in init
self.app.loader.init_worker()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/loaders/base.py", line 128, in init_worker
self.import_default_modules()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/loaders/base.py", line 116, in import_default_modules
signals.import_modules.send(sender=self.app)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/utils/dispatch/signal.py", line 150, in send
response = receiver(signal=self, sender=sender, *_named)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/amqp/utils.py", line 42, in call
self.set_error_state(exc)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/amqp/utils.py", line 39, in call
*_dict(self.kwargs, *_kwargs) if self.kwargs else kwargs
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/app/base.py", line 297, in _autodiscover_tasks
self.loader.autodiscover_tasks(packages, related_name)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/loaders/base.py", line 251, in autodiscover_tasks
related_name) if mod)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/loaders/base.py", line 272, in autodiscover_tasks
return [find_related_module(pkg, related_name) for pkg in packages]
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/loaders/base.py", line 291, in find_related_module
return importlib.import_module('{0}.{1}'.format(package, related_name))
File "/usr/lib/python2.7/importlib/init.py", line 37, in import_module
import(name)
from momsplanner.tasks.social_commerce import fetch_social_deals
File "/home/eugenekim/Documents/zibann/momsite/momsplanner/tasks/social_commerce.py", line 9, in
User = get_user_model()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/contrib/auth/init.py", line 127, in get_user_model
user_model = get_model(app_label, model_name)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/db/models/loading.py", line 271, in get_model
self._populate()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/db/models/loading.py", line 78, in _populate
self.load_app(app_name)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/db/models/loading.py", line 99, in load_app
models = import_module('%s.models' % app_name)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/utils/importlib.py", line 40, in import_module
import(name)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/debug_toolbar/models.py", line 63, in
patch_root_urlconf()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/debug_toolbar/models.py", line 51, in patch_root_urlconf
reverse('djdt:render_panel')
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 480, in reverse
app_list = resolver.app_dict[ns]
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 310, in app_dict
self._populate()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 262, in _populate
for pattern in reversed(self.url_patterns):
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 346, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 341, in urlconf_module
self._urlconf_module = import_module(self.urlconf_name)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/utils/importlib.py", line 40, in import_module
import(name)
File "/home/eugenekim/Documents/zibann/momsite/momsite/conf/local/urls.py", line 9, in
(r'', include('%s.common.urls.admin' % CONF_MODULE)),
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/conf/urls/init.py", line 26, in include
urlconf_module = import_module(urlconf_module)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/utils/importlib.py", line 40, in import_module
import(name)
File "/home/eugenekim/Documents/zibann/momsite/momsite/conf/common/urls/admin.py", line 4, in
admin.autodiscover()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/contrib/admin/init.py", line 29, in autodiscover
import_module('%s.admin' % app)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/django/utils/importlib.py", line 40, in import_module
import(name)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/djcelery/admin.py", line 295, in
class PeriodicTaskAdmin(admin.ModelAdmin):
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/djcelery/admin.py", line 297, in PeriodicTaskAdmin
form = periodic_task_form()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/djcelery/admin.py", line 251, in periodic_task_form
current_app.loader.import_default_modules()
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/loaders/base.py", line 116, in import_default_modules
signals.import_modules.send(sender=self.app)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/utils/dispatch/signal.py", line 150, in send
response = receiver(signal=self, sender=sender, *_named)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/amqp/utils.py", line 42, in call
self.set_error_state(exc)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/amqp/utils.py", line 39, in call
*_dict(self.kwargs, **kwargs) if self.kwargs else kwargs
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/app/base.py", line 297, in _autodiscover_tasks
self.loader.autodiscover_tasks(packages, related_name)
File "/home/eugenekim/virtualenvs/zibann/local/lib/python2.7/site-packages/celery/loaders/base.py", line 251, in autodiscover_tasks
related_name) if mod)
TypeError: 'NoneType' object is not iterable

[ask]

I don't know why but the syntax used in the SO question is outdated, you must use
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS) now: http://docs.celeryproject.org/en/latest/django/first-steps-with-django.html