"LoadAnimation requires the AnimationController object to be a descendant of the game object"

[DEVLocalPlayer (LocalPlayer)]

The error is stated in the title. I get this error:

I’m just trying to animate a custom tail I made, but it simply doesn’t animate cause of this error.
My code:

    local animation = Instance.new("Animation")
    animation.AnimationId = "rbxassetid://---" -- I censured the ID (ik I'm too cautive, sorry lol)
    			
    local controller = Instance.new("AnimationController")
    controller.Parent = Tail			
    			
    local animator = Instance.new("Animator")
    animator.Parent = controller
    animator:LoadAnimation(animation):Play()

If anyone knows how to fix this, please tell me cause it’s really annoying me.