Cubase 5 - No device is connected to the PC

Hello Everyone! i need a help!
when i’m trying to select my Behringer X18 digital mixer in Cubase 5 VST Audio System, it keeps saying: No device is connected to the PC. What might be a problem?

I found this tutorial for another version of the mixer but it looks like it might help you. I only browsed this video but it does appear that there may be a couple gotchas buried deep within software tree of the unit