JVC KD-R450 not playing iphone 5 music?

Okay, so I got this radio today, and it keeps saying "can't play" when I plug my Iphone 5 into it. I have it on the "USB" setting though. So I'm stumped. Any feedback would be greatly appreciated.

New Radio = Manual… Did you read it?
http://a248.e.akamai.net/pix.crutchfield.com/Manuals/105/105KDR540.PDF

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