I had same problem, trying to reject CD out but door jammed, trying to play others got "error 3". Searched for solution on line, maybe in this forum or others somebody said using a CD poke the door while trying reject, I tried it worked.
First I hit reject button, player made some noise, door jammed... I used a CD poked at the bottom of the slot not too hard, holding the CD at about 45 degree, guess what? CD pop out from the player, reloading different CD in (of course, threw away that problem CD) worked fine.
Trying to eject other CD, same problem. Did it again, CD reject no problem.
Conclusion, problem not from CD but from the player itself... motor or door doesn't work correctly.
My 2005 RX has 178k miles already no more warranty, I will live with it. The car still running fine.
Hope this help.