Why Rejected My 404 Page

I uploaded my third item to ThemeForest and They have all rejected.
Can you help me to find the problems to be able to improve my future uploades?
My item is a 404 error page and you can see it in the following link
Any help will be great.

Quite basic design, it doesn’t offer anything new comparing the items on the market already

thank you for giving me your precious time.