issue with 0th level spells in custom class.

[Aellonaeron]

So, I'm creating a custom class that a friend of mine really wants to play, but I'm running into a single issue, which should be easy I think, but for the life of me, I can't find it.

I added spells known, and gave them 3 0th level spells known at level 1, then up to 9 at level 20.
In the spells cast per level I left the level 0 column empty and clicked the 'cast infinite level 0" option.

But when I load the class, for level 0 it says 'any' but no number for spells known, and as soon as i select a single 0th level spell to learn, it says 'Excess level 0 spells'

Is there a toggle I'm missing somewhere?