Vrcd400-sdu error code 13

Question

my stereo shows an error 13 when I try to play my usb. Does anyone know what the problem might be.Hi, i got the same problem with an error 13 code when i insert  sd card in my vrcd400 sdu unit.  Worked fine for 3 months  but i recently removed card to edit play list and when i plugged card back in,  i get error 13 code. Tried other sd cards and get same error. Tried the reset button. No luck.  Anyone find a solution yet??