That is a client side problem, I recommend you download the latest kRO client or run your rsu patchers from time to time to update your client. There are items in the rA database that don't have sprite in the kRO client (I believe some are found in jRO?) and they could result in sprite error. @item at your own risk. If you want to continue to use the char, don't put on any errored items and @dropall when you relog. It will give you an error while the item is on the floor which it will disappear later.