HoW to fix error in sound driver not enough channels?

i just got Numark DJ iO and i want to hook it up to my mix so that i can play mp3's on my set. but we i go to virtual DJ i click config -> input: none; output: external mixer; Sound Card: Asio; And in the drop down box : Numark USB Audio Device. But when i click ok it say Error in the sound driver: not... show more i just got Numark DJ iO and i want to hook it up to my mix so that i can play mp3's on my set. but we i go to virtual DJ i click config -> input: none; output: external mixer; Sound Card: Asio; And in the drop down box : Numark USB Audio Device. But when i click ok it say Error in the sound driver: not enough channels. help please !!
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