Does it at least drop off the other probes and error when it tries to go to 3 or does it just error the instant it tries to start the change for one probe to the next?
Also look at your port location. I accidentally changed a port location and it did the same thing.
Is calibration part of the inspection program ? Unless its a long inspection, will it run without the calibration portion ? I have seen some stoopid errors like that and they were " way later " in the program. As in it was erroring out and stopping as it was " reading ahead ".
At my shop, 2 previous "programmers" tried and failed to get our probe racks to work. It was so bad that they were telling management that one machine wouldn't even work because the the rack was so messed up. At one point, I was on the phone with The Vatican, attempting to schedule an exorcism. I feel your pain.