My submission always failed and cannot check the result

I am interested in this challenge:

I tried to submit my file but the Status result is always “Failed” with the following Stderr message.
ORGINIAL EXCEPTION: No such relation between Challenge Phase and DatasetSplit specified by Challenge Host
Traceback (most recent call last):
File “/code/scripts/workers/”, line 585, in run_submission
File “/usr/local/lib/python3.7/site-packages/django/db/models/”, line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File “/usr/local/lib/python3.7/site-packages/django/db/models/”, line 408, in get
challenges.models.ChallengePhaseSplit.DoesNotExist: ChallengePhaseSplit matching query does not exist.

When I submitted it last week, although it was “Failed,” I could see the Result file and check the score.
However, these days, I cannot check it. What is the problem?

Thank you