That error is the "bad" one.
When mine had been replaced and the replacement came up with the same error a year later (and out of warrantee) I decided to get the CDs out and see what the problem was.
It seemd that the CD rack positioning jack screws (3 of them) are white plastic and wear quickly. Once worn to the point where the rack does not position its self correctly, you get the error.
Mine was tilted and jammed with the jack screw gears worn and loose. It was not easy getting the CDs out but I managed.
Rather than buy another of these units, I purchased a Pioneer head unit and a poineer CDX-PD6 that fits in the same space as the Isuzu multi changer.
VX's don't need no stinking mod's.
But they're sure fun!