How can I fix my 1990, Olds Eighty eight cassette player?

I recently tried putting a tape in the player, but after i removed it the player will not stop acting like there is still a tape in it & continues to try playing one. Therefore, the only way to play my radio is to press the rewind or fast forward button. Please help. I have tried ejecting the non-existent tape, but will still keep trying to play it.