This error message can have two solutions. Please read both.
This was an early issue. We found the problem. And is resolved in Game Update 2.2
Early workaround was to power off - wait 10 sec. power on.
If you have last game code, and still see this message.
Please check that USB cables are connected like this.:
- Playfield Controller Box [USB - IN1] to Backbox Controller Box [USB 1]
- Playfield Controller Box [USB - IN2] to Backbox Controller Box [USB 2]
Figure.: Playfield Controller Box (located under playfield in the back)