How to make a punching animation do damage?

I made a punching animation but I am trying to make my animation do damage to dummies, but the animation wont play! If anyone can tell me what I'm doing wrong that would help a lot.

My code:

player=game.Players.LocalPlayer
mouse=player:GetMouse()

function KeyD (key)
    key=key:lower()
    local hotkey=script.Hotkey
    local char=player.Character
    if key==hotkey.Value then
        local dance=Instance.new("Animation")
        dance.AnimationId="https://web.roblox.com/Punch-item?id=476354090"
        local animloader=char.Humanoid:LoadAnimation(dance)
        animloader: Play()
    end
end
script.Parent.Touched:connect(function(part)
    local human=part.Parent:findFirstChild("Humanoid")
    if human then
        if human.Parent.Name~=script.Parent.Parent.Parent.Name and
CanDamage == true and script.Parent.Parent.Swinging.Value==true then
            CanDamage=false
            human:TakeDamage(20)
            wait(1.7)
            CanDamage=true
        end
    end
end)
mouse.KeyDown:connect(KeyD)