I do not know what happened and I cannot submit a result.
More information.
Hi @wenhaowang, the best way to get support is to email info@drivendata.org rather than post in the forums. You should be able to refresh the submission page (potentially hard refresh ctrl+shift+r to clear cache), and it should work as normal. Send a follow-up email if you are still having issues.
Ok, I will email info@drivendata.org if it does not work tomorrow.