[Devnullicus]

Actually, it does look like your base facilities.txt has been modified.

The line
Ability 1 Amount 1 Formula := trunc(([%Level%] / 10) 1)

should be (and is in my version):
Ability 1 Amount 1 Formula := trunc(([%Level%] / 10) + 1)

Somehow, your version lost a "+" sign...

That will definitely cause the formula parser to flag it as a bad formula, but shouldn't cause the exception that you posted. Let me figure out why the program isn't catching the error correctly as it does seem like this is a problem on my end.

Thanks for helping with this, Elsemeravin!