How do i fix this error?

wait(0.01)
local enabled = true
Player = game.Players.LocalPlayer
character = Player.Character
mouse = Player:GetMouse()
run = game:GetService("RunService")
RS = Player.Character.Torso["Right Shoulder"]
LS = Player.Character.Torso["Left Shoulder"]

function onKeyDown(key)
	key = key:lower()
	if key == "x" then
		for i = 1,5 do
			RS.C0 = RS.C0 *CFrame.Angles(0, 0, 0.5)
			wait()
		end
		for i = 1,5 do
			RS.C0 = RS.C0 *CFrame.Angles(0, 0, -0.5)
			wait()
		end
		for i = 1,5 do
			LS.C0 = LS.C0 *CFrame.Angles(0, 0, -0.5)
			wait()
		end
		for i = 1,5 do
			LS.C0 = LS.C0 *CFrame.Angles(0, 0, 0.5)
			wait()
		end
		script.Parent.Touched:connect(function(hit)
			if hit.Parent:IsA("Model") then
			if hit.Parent:FindFirstChild("Humanoid") ~= nil then
			hit.Parent["Humanoid"].Health = hit.Parent["Humanoid"].Health - 5
		end
	end
end)

	end
end

mouse.KeyDown:connect(onKeyDown)

Touched is not a valid member of Backpack