When ever I try to export a track to iTunes I get this error (see attached pic). Also, I created another user account for my dad and brother to use so that they could get to GarageBand (they love it!) called "Guests". GarageBand runs fine, and when I try to export to iTunes it runs as normal and creates the mix down, but, when it's complete, nothing happens. iTunes does not launch, and no file has been generated if I look for it. Any ideas on any of this?