That error can be a little more challenging to solve . I don’t know how it knows the difference but the cables have to be on the correct proximity switch. If you don’t have both proximity switches properly spaced between the moving targets you can get multiple error codes . Too close and they don’t get the “off” they need. Too far and they don’t get the “on” long enough . If it’s an older machine you might want to replace both proximity cables. I buy replacement cables from automation direct and they’re only $25 each or so.