When I tried to send "withdraw" the HYPER to the Exchange Address from my Cryptopia account, I get a message saying" invalid HYPER address".
Try sending it to HB9bkNQkVaHZ5muudwiTDWtgeANxBwNCZg and use that TxID in the form.
All what i can say is that maybe Cryptopia has blocked either swap address or has blocked HYPER withdrawals at all.
If that is the case then they have been noticing increased number of withdrawals in the process. And they want to stop it. Hope not. Please tell us if your withdrawal was successful.