More than one scheduler, the error raises about TypeError("'run_spiders' object is not iterable",)

[itualoha]

Firstly, it is an amazing project.

Everything is okay for the example project.

But when I add more than one scheduler for the different kinds of scraper, the background reports the error of type error. The following error information is coming from my test project. How to fix the problem?

[2019-07-21 12:48:19,115: ERROR/MainProcess] Task spideradmin.tasks.run_spiders[59c5b7cc-6078-49b2-8e84-1873edc7479a] raised unexpected: TypeError("'run_spiders' object is not iterable",)
Traceback (most recent call last):
File "/opt/anaconda3/lib/python3.6/site-packages/celery/app/trace.py", line 240, in trace_task
R = retval = fun(*args, **kwargs)
File "/opt/anaconda3/lib/python3.6/site-packages/celery/app/trace.py", line 438, in protected_call
return self.run(*args, **kwargs)
File "/var/projects/spideradmin/spideradmin/tasks.py", line 18, in run_spiders
t.run_spiders(TendersWebsite, 'scraper', 'scraper_runtime', 'tender', *args, **kwargs)
File "/opt/anaconda3/lib/python3.6/site-packages/dynamic_scraper/utils/task_utils.py", line 73, in run_spiders
ref_obj_list = ref_obj_class.objects.filter(*args, **filter_kwargs).order_by(runtime_field_name + '__next_action_time')[:max]
File "/opt/anaconda3/lib/python3.6/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/opt/anaconda3/lib/python3.6/site-packages/django/db/models/query.py", line 781, in filter
return self._filter_or_exclude(False, *args, **kwargs)
File "/opt/anaconda3/lib/python3.6/site-packages/django/db/models/query.py", line 799, in _filter_or_exclude
clone.query.add_q(Q(*args, **kwargs))
File "/opt/anaconda3/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1260, in add_q
clause, _ = self._add_q(q_object, self.used_aliases)
File "/opt/anaconda3/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1286, in _add_q
allow_joins=allow_joins, split_subq=split_subq,
File "/opt/anaconda3/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1161, in build_filter
arg, value = filter_expr
TypeError: 'run_spiders' object is not iterable