Error upon Submitting Docker Image

Hi, I uploaded a .tar.gz file for Sanity check phase, it is throwing error saying """ Dear ayushij074,

Unfortunately we were unable to validate your docker image.

The error message was:

Could not find manifest.json in the container image file. Was this created with docker save?

To correct this please upload a new container. "" This file, manifest.json is not used by my code, is there any expectation for this file from your side?

I will contact the grand-challenge.org support to help us figure this out.

The platform needs the manifest file to determine the uniqueness of the container. This file is automatically generated with the docker save command. Is it possible that you have saved it in some other way? Using the docker save should be fine to proceed.