Could not submit the answer of February Cook-off

Can anyone tell me what is the problem?
My internet connection is okay.

Did you submit at last minute of the contest?

It happens when you submit your solution at last 2 or 3 minute…
Don’t worry you can try once again

no, sir. I just submited the problem 1 hour ago before the contest end.
you see my creating this topic time? I posted it before the contest end. so how can i submit it at last minute