Noob needs cross class ability question answered please :(

[TyloRime]

I am on my level 25 THM and I would like to be able to use "raise" "protect" "Aero" and it tells me I cannot use them in my current class when I try to use it?

Can I not use these?

Were you level sync'd by any chance? If you're sync'd by way of doing FATES or Dungeons, and are below the level you learn the ability you're trying to use (or the level where you open up that available cross class slot (you get another cross class slot every 5 levels I believe?)) you'll get that error message.