Reply to Traktor Crach 2.6.3

Hello everyone!I have traktor problem.I have install alla the drivers and i seat to play with my pc keybord and with mouse.All works perfwctly.Then i plug in my midi controller xone k2.Also all works perfectly.BUT today i plug in me xone k2 and nothing happens and when i close traktor this message show up :
Do you know why?

Thanks!