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)