Is that the only error when you are about to withdraw your funds there?
It's unusual if they ask you to message the support first if you withdraw unless they have something smelly and fishy to do with you. What's the coin and how much is the amount you are trying to withdraw?
I withdrawn about. 0.89 eth
Ouch!
$313 is the price of Ethereum for now.
And that's around $278 that you have there, to me, that's amount is near to huge. What's the message of the support after you have contacted them for your withdrawal? do they ask for a deposit again?