Hi Heroes!
All is fine comrade, its nothing about you - the devs are just weird guys!
I can confirm this issue, but I cannot say why its happening. I have been on A3 dev branch, then A3 RC and now LIVE with 1.68 and I have seen this error the first time when testing your mission with the many custom modules. So it may as well only happen since 1.68.
While it is correct, that checking if ALiVE is loaded with ALiVE_fnc_isModuleAvailable isn't very sensible, I also get the error with ALiVE loaded, which actually makes no sense.
My best guess is, that with 1.68 there are suddenly issues with initialising functions before the "game" has started (ergo 3DEN and intros). So it's nothing you did wrong at all, but I am not sure if we could fix that at all. The error would also be fixed, if the check would use a cfgPatches call to detect ALiVE instead of the ALiVE function.
I am also not sure if this has ANY gameplay effect at all, as the function is then available! Feel free to ask, if this doesn't make any sense to you! I am all there for you, mate!
HH