Getthistoworkplease

Hey Guys, I've had this device for the past year an for some reason my iphone won't play any music. I plug my Iphone 5 in and it shows all my music and even shows spotify but it won't play through the audio. Does anyone have the same issue? Is there anyway to fix this problem? Help! Thanks! =) P.S. it has never work with any iphone or Ipod