This version of Hero Lab, no more than 6 classes?

[Draidis]

In the validation details of one of my PC's I get in bright red the text:

Hero: This version of Hero Lab does not allow you to take more than 6 character classes.

- Obviously this would seem pretty self explanatory as to what the problem is (I have over 6+ Classes/Prestige Classes on one character) but in some builds of a the identical character it doesn't show up at all and others not until I have like 8 levels of my 6th class but still not MORE than 6 classes.

I'm just wondering if this is a glitch or am I misunderstanding what the warning is really for. Also what is the consequence of this 6 class "limitation" because it seems to let my add as many classes as I want despite the warning with no negative (at least noticeable) impact on the character build.

Thanks!