How to stop animation when tool is unequipped?

Im trying to make a animation play every time you equip a tool. It works when i equip it, but when i unequip it, the animation keeps on playing.

The error is:    Humanoid is not a valid member of Backpack "Players.fireyfoxninja21.Backpack" - Server - Animation:17

Can anybody help figure out why this wont work?

(I used a normal script inside of a tool, with a handle.)

local Tool = script.Parent
local Animation = Tool.Animation

Tool.Equipped:Connect(function()
    local Player = Tool.Parent
    local Humanoid = Player.Humanoid

    local AnimationPlay= Humanoid:LoadAnimation(Animation)
    AnimationPlay:Play()

end)


Tool.Unequipped:Connect(function()

    local Player = Tool.Parent
    local Humanoid = Player.Humanoid

    local AnimationPlay = Humanoid:LoadAnimation(Animation)

    AnimationPlay:Stop()
end)