hp latex 64 cutter "up down encoder not working- reboot"

I have constant issues with this machine. Unusual to turn on and start cutting without some form of error. This is today's issue. I cleaned the pinch rollers hoping that would help and didnt. Any advice? Thx

sorted myself thanks lol.. appears to be an issue with the rollers underneath they have scratches on them. Im sure thats where the sensors are. I tried a small piece of media to clear the fault and then it worked when I put my large sheet back in.