Bards and Metamagic

[Lorelie]

I have not been able to do extensive testing on this, but Lorelie has three metamagic feats that do not seem to work for bards: extend spell, heighten spell, and persistent spell. As described these use higher spell slots for those that use spell slots, but I don't use spell slots. When I try to cast with them on in combatmode I get the message 'You do not currently have enough power to cast 'X', is this known with bards and metamagic?