Adding Class Abilities as Feat Prereqs

[Johnny Scott]

Hi Guys!

Can someone provide me with the code I should use to apply class abilities (specifically, Animal Companion class feature and Wild Empathy class feature) as a Prerequisite for a feat? I have tried creating a feat by copying a similar existing feat (Natural Spell) and changing the ability, but keep receiving an error when I test it.

Thanks in advance for your help!