Also worthy of note, on about 1/50 boot ups my Flashback (similar technology) throws up this alarm. I find that a quick jiggle of the stake/prizes key and a reboot sorts the problem.
More likely to be invalid settings/invalid key though.
I have tried to chnage the pay out percentage key as that is the only key that I can find. But sadly even after changing that the same error comes up. Is there a way of maybe resetting the whole thing or even another key which i dont know about? lol