I have had this problem 3 times in the last couple months. I received the error when I was attemping to change to another disc in the 3disc changer. After which I can only eject the maganize with one disc remaining the the unit.

To fix this I remove to two discs in the magazine, and insert the magazine with a little more force into the deck than I would normally. This causes the mechanism the maganize sits in (the part that comes out and says DO NOT TOUCH) to be pushed into the unit a couple of millimeters. Be sure not to push it in for too long (push for <1sec), because if this works the unit will try to extend the mechanism.

So, if this works, the mechanism extends and loads the remaining disc back into the maganize. When it retracts back into the deck, you can then eject it, and load your other discs back in.

good luck