My existing conventional light switch was connected only to the red (top, painted over somewhat) and black (bottom) wires shown here. I just bought a Lutron motion-sensing switch and its instructions say it requires grounding.
The new switch has a bare wire and a green wire coming out of it for grounding, but I'm not sure what to do with those. I tried leaving the ground wires dangling in the back and merely connecting the red and black wires from the wall to the switch, as was done with the existing switch, but it did not work.
From what I can understand, the wiring coming from the wall is already grounded because it is attached to the electrical box itself in two places (see photo) using a screw. Do I need to unscrew that and attach the new switch's ground wires to that connection point?