submission worker error : 'NoneType' object has no attribute 'get'

[RyanLHU]

When I upload an evaluation script, the system shows the following error messages at the server side
(I follow the instructions in https://evalai.readthedocs.io/en/latest/challenge_creation.html#challenge-configuration-examples to create the challenge)

worker_1_c60bbe8e7733 | [2019-05-27 17:50:28] ERROR Exception while receiving message from submission queue with error 'NoneType' object has no attribute 'get'
worker_1_c60bbe8e7733 | Traceback (most recent call last):
worker_1_c60bbe8e7733 | File "/code/scripts/workers/submission_worker.py", line 600, in process_submission_callback
worker_1_c60bbe8e7733 | process_submission_message(body)
worker_1_c60bbe8e7733 | File "/code/scripts/workers/submission_worker.py", line 579, in process_submission_message
worker_1_c60bbe8e7733 | user_annotation_file_path,
n process_submission_callback
worker_1_c60bbe8e7733 | File "/code/scripts/workers/submission_worker.py", line 326, in run_submission
worker_1_c60bbe8e7733 | challenge_id
worker_1_c60bbe8e7733 | AttributeError: 'NoneType' object has no attribute 'get'

I know this problem has been discussed in #2254. However, it is close but I cannot find any solution on this problem.

[RyanLHU]

I found the fix #2277 that makes the submission_worker.py working in DEV environment.

[RishabhJain2018]

This is fixed.