i am having problems with my cassette player, everytime i put a tape in or even my cassette adaptor for my mp3 player, it displays TAE-r. i believe that means tape error. i tried coupe tapes and it's the same. when i put a tape in the first time it worked but then when i went to put it back in, it didn't. what do u think is wrong with it. is it just dirty??help mr please! thanks