Hello... I have had a Carnival Night Slot Machine for about 6 or 7 yeard now with no problems. The other day for the first very time my grandson hit the big one and it ran for about 10 minutes and I thought it emptied the hopper. Two days later my granddaughter hit it like that again and it did the same thing, however when it finished its thing she she pushed the "credit payout" button on the left front. At that time it started flashing "ERR". I've lost the key but I can get it in from the underside... I need some help... I will be thank full for any I can get.

Thanks
Rick