You can’t put an ID inside :LoadAnimation(). Rather, you should put an Animation Instance instead.
local animation = Instance.new("Animation")
animation.AnimationId = "http://www.roblox.com/asset/?id=2510202577" -- Your Animation ID
local animationTrack = humanoid:LoadAnimation(animation)
Make an animation instance for each animation track. Hope this helps, let me know if it’s not solved yet.