Question Issue with Animation Controller

I imported a character asset, as well as an animation asset. While trying to make an animation controller (Using the character, it's avatar, and the animations in the asset I got) I got this message: 'Player' AnimationEvent 'OnFootstep' on animation 'Walk_N' has no receiver! Are you missing a component? I don't know too much about animations, and I don't know how to add a reciever (or even access the event), or otherwise resolve this issue.