That's not an error page, that's was happens when a submission gets blammed.
Blamming happens when a submission receives a low score during judgement. It is a community vote, so games are not randomly removed unless it is rule-breaking.
You can learn more about blamming/saving here:
https://www.newgrounds.com/wiki/help-information/user-accounts/blams-and-saves
Did you upload a test? Usually tests don't do so well during judgement especially if the core game mechanics are not implemented yet. I would suggest to upload a game demo when you get the core game concept and mechanics working for better chances of passing judgement.
NewgroundsTelly
newgrounds is sus
WolfyRed
suspicious! O.o