Rear light error message

No wonder I get an error MSG when I turn on the lights saying a light bulb is out in the rear. I pulled the mat back in the hatch and this is what I see laying there.

Those are speaker wires... They don't have anything to do with lights in your car...

It does look like you are missing the white fiberglass patch that covers the gas tank access port - the black plastic disc on the right. You can see where it was glued. Itès not very important, and again, nothing to do with the lights...