My sword script's animations not working?

Hello, Im new at scripting and I need some help. So, I have a sword script and the damage works fine, but the animations... When I equip the sword the idle animation one hand does what have to do but the other stays default, after I click the attack animation works and my hands make idle animation normally. When I unequip the Sword my hands stuck in Idle animation. I also get an error: "Humanoid is not a valid member of Backpack" I also used this video to make the swords handle cause I dont have tool grip editor... https://www.youtube.com/watch?v=dRGEAethTGA

Script:

script.Parent.Blade.Touched:Connect(function(p)

if script.Parent.CanDamage.Value == true then

script.Parent.CanDamage.Value = false

p.Parent.Humanoid:TakeDamage(20)

end

end)

LocalScript:

local canAttack = true

script.Parent.Equipped:Connect(function()
    local idle = script.Parent.Parent.Humanoid:LoadAnimation(script.Idle)

    idle:Play()
end)

script.Parent.Unequipped:Connect(function()
    local idle = script.Parent.Parent.Humanoid:LoadAnimation(script.Idle)

    idle:Stop()
end)

script.Parent.Activated:Connect(function()
    local attack= script.Parent.Parent.Humanoid:LoadAnimation(script.Attack)
    local idle= script.Parent.Parent.Humanoid:LoadAnimation(script.Idle)

    if canAttack == true then
        attack:Play()
        idle:Stop()
        canAttack = false
        wait(1)
        attack:Stop()
        idle:Play()
        canAttack = true
        script.Parent.CanDamage.Value = true
    end

end)