You will get an error if the pinch roller is not lined up with the grit roller, usually the printer has marks to show where you are allowed to place the pinch rollers. The error my printer gives is "Pinchroll error: Invalid left (or right) position".
Otherwise, I don't know of any other pinchroll errors (except when you forget to lower the pinch roller). An adjustment option might be to change how much pressure there is from the pinch roller...?