Submission status failed: bad address

Hi Evalai Team,
I run into some trouble, while trying to create a challenge, here is where I am: I unloaded the and create a challenge, but when I tried to evaluate the uploaded sample submission, it keeps running for 20h before I show "failed’’ the stderr looks like this:
Traceback (most recent call last):
** File “/code/scripts/workers/”, line 466, in run_submission**
** File “/tmp/tmpw2y9gntm/compute/challenge_data/challenge_946/”, line 275, in evaluate**
** gt=json.load(f)**
** File “/usr/local/lib/python3.7/json/”, line 293, in load**
** return loads(,**
OSError: [Errno 14] Bad address

The submission worker log keep shows the following repeatedly after my submission:

any idea where could be wrong? Thx