Novaexchange is one of the major cryptocurrency exchange. As per official website it will have new owners and management effective April 2018, with major upgrades to the exchange to better handle scaling, stability and security. So they have given instruction. If you are trading on Nova then withdraw your fund as per the instruction.
Preliminary plan:
2017-10-30 This information goes public, user registration closes, addcoin page closes, disabling deposits of ETC and ETH
2017-11-30 Deposits disabled for ALL coins, all users get level 3 verified account level
2017-12-15 ONE last deposit scan to take care of deposits made after 2017-11-30
2018-01-31 Email reminder to all registered users
2018-02-28 Trading engine stops, dice game stops, API stops
2018-03-31 Login stop, website replaced with information
2018-04-15 Support closes, all Novaexchange user data removed
Remaining user balances that has not been withdrawn before 2018-04-01 will be considered a donation and is not refundable.
So if you any funds there then transfer it to other exchanges if available else withdraw your fund. Currently due to high withdrawal request sometimes withdrawal request fails. So be patient and plan your funds.