The icon represent me EVERY TIME I worked with vision. I'm human and I keep repeating the same mistake every time, well it's getting better now, lol
This is what I learned.
BEFORE Autocalibration, You were using your TCP to define your GRID frame. Can you imagine how many error are you introducing doing that ? Right there, on your main setup you are not being perfect, then dont expect the vision to be perfect.
AFTER Autocalibration. You let the robot find were the grid is. Trust me, It's going to be much better that then one you did and not only that, now , you can blame Fanuc for the mistake.
You are working within one mm, mmmmhhh ? maybe your grid selection is bad. I will use the 5 mm grid BUT that also depends on your focal distance How far away are you taking the picture from ?