I notice that several other people had the identical problem and the same “wiring error” message in this thread: Dim D7 LED and no other lights` but no resolution for them either. I even verified jumper continuity by checking the resistance directly between the corresponding source and target pins, right on the header solder connections, in case I had a bad jumper wire or breadboard clip. Everything’s connected. There’s no “wiring error”.
Sigh - I guess it’s support ticket time, though I’d really rather get this one running again if possible.