When you originally submitted the files, the moderation team put them in "remind to complete" mode with the explanation that a property release was required to confirm you are the original artist as opposed to snapping a photo or scanning artwork created by someone else.
You then resubmitted the files without the necessary release. It's only a one time reminder so when you resubmitted without complying with the requirement for a release, the content was rejected for non-compliance.
You can resubmit the work with the required property release but you will need to upload it again first.
Good luck,
Mat