Animation for Custom Rig only plays in Studio?

Using MeshParts and Motor6D's I put together a custom rig for what's essentially a giant robot. Everything seems to be put together right and I created multiple animations for them, here's a few:

Walking Animation Running Animation Flying Animation

I wrote a short script for playing one of the animations, and running it in studio it seems to work perfectly but once I open the game in a live server the script doesn't appear to do anything. Something else that's interesting is that usually an NPC will only play an animation when loaded into an AnimationController, but this animation only plays in studio when loaded into the robot's Humanoid and not in game or in studio if I load it into an AnimationController. Here's the short script I wrote to play the animation:

function wyd()
--  local AC = Instance.new("AnimationController")
--  AC.Parent = script.Parent
    local AC = script.Parent.Humanoid
    local anim = Instance.new("Animation")
    anim.Parent = script.Parent
    anim.AnimationId = "http://www.roblox.com/asset/?id=440188691"
    local animTrack = AC:LoadAnimation(anim)
    animTrack:Play()
end

wyd()

Let me know if you see anything immediately wrong with my code or with how the rig itself might not be correctly set up? Thanks!