Reply to Traktor 2 problem

just trying to get my settings right and running into problems. if you all could provide feedback or help troubleshoot it would be much appreciated
so i have pretty much a pa system right. 2 peavey pr12 speakers, a crown xl2000 amp, and a USB numark mixer. in traktor whenever i change my audio output to the USB it crashes automatically and gives me a crash report and whatnot. any idea why? should i not change it to that.