If the electronics doesn't recognise the cassette is there, it will not operate the eject. It can be a case of opening the unit up to manually eject the cassette.The head unit in my p38 is telling me that the cd magazine is missing, but it is in place , however I cannot eject it , I've been in the boot and pushed the eject button and nothing , anyone got any ideas , Thanks
Mine did the same.
The "cure" was to open the door and rap smartly on the magazine with a rubber handled screwdriver.
Bingo! it opened.