Why Rejected My 404 Page

I uploaded my first item to ThemeForest and it was 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.

Seriously ? I think why you were rejected is pretty obvious.

If you have uploaded this item in 2010 or before, it could be accepted but now the requirements in Themeforest are too much high, take a time and look at this 404 pages : https://themeforest.net/category/site-templates/specialty-pages/4-4-pages?sort=date#content,
you can inspire from them.
Don’t worry, we all have a difficult start,
Good luck my friend.

I have understood, i will try again.
thank you.