Single coil knee evaluation submission

I am trying to make a submission to public leaderboard for single coil knee reconstruction. I prepared outputs of two base networks with partial data. One is unet and another is simple cascade network. In terms of structure, file content everything looks exactly similar. But the zip with cascade is not getting approved. I am getting a red mark for that submission while green mark for the other. I submitted under the team name HTIC. Can you please provide the error feedback for the submission ? And also can anyone please list the procedure and problems faced for the submission.