Resit the grounding wire from both sides.
Unscrew the pin remove the wire and reinsert it.
Make sure the bare wire is in the pin and no insulation cable caught and tighten the pin.
That should fix the problem.
Resit the grounding wire from both sides.
Unscrew the pin remove the wire and reinsert it.
Make sure the bare wire is in the pin and no insulation cable caught and tighten the pin.
That should fix the problem.