Hi everyone. I just bought a traktor S4 mk1 controller. When I tried to add the serial into native access. I get on error . I think the s4 might have been registered before. Do I need a transfer license. I have the serial code that came with it . But I does not seem to work. Is this item useless now or can I get around this issue. I have contacted native instruments about it. So hopefully they can help . Thanks everyone for your help.