Why my animation not playing while sitting ?

I created this script to play an animation while seating but it doesnt work , it work with an ordinary roblox animation but when i use mine it doesnt work ... I already choose all stage of permission but it doesnt work .

Here the sript:

local seat = script.Parent



function SeatIsSatIn(hit)

if hit.Parent:FindFirstChild("Humanoid") then

local character = hit.Parent

local humanoid = character.Humanoid

wait(0.5)

if humanoid:GetState() == Enum.HumanoidStateType.Seated then

local animation = Instance.new("Animation")

animation.AnimationId = "rbxassetid://3160530487"

local track = humanoid:LoadAnimation(animation)

track:Play()



local function StateChanged(oldState, newState)

if newState ~= Enum.HumanoidStateType.Seated then

track:Stop()

end

end



humanoid.StateChanged:connect(StateChanged)

end

end

end



seat.Touched:connect(SeatIsSatIn)