my weapon wont attack at all?

so heres the basics, im making a weapon. wont work. help.

the script was from https://www.youtube.com/watch?v=hWvqqBZUPco

script:

--This is the main script of the weapon. scroll down for the stuff you edit.

local tool = script.Parent.Parent
local player = nil
local character = nil
local humanoid = nil
local blade = tool:WaitForChild("Blade")
local animation = tool:WaitForChild("Animation")
local equipped = false
local canDetect = false

local comboAnim = animation:WaitForChild("Combo")
local equipAnim = animation:WaitForChild("Equip")
local holdAnim = animation:WaitForChild("Hold")
local slashAnim = animation:WaitForChild("Slash")
local slash2Anim = animation:WaitForChild("Slash2")

local comboTrack = nil
local equipTrack = nil
local holdTrack = nil
local slashTrack = nil
local slash2Track = nil

local equipSound = blade:WaitForChild("EquipSound")
local hitSound = blade:WaitForChild("HitSound")
local slashSound = blade:WaitForChild("SlashSound")
------------------------------------------------------------------------------------------
-- the config zone
local Damage = 10
local CoolDown = 0.3
local Combo = 1
local LastSwing = tick()
local CanDamageNPCs = true
local CanDamagePlayers = true
------------------------------------------------------------------------------------------
--more sword stuff
local function damage(hum, isPlayer) --damage stuff
	--chacking some damage stuff
	if (isPlayer and CanDamagePlayers) or (not isPlayer and  CanDamageNPCs) then
		--some damage stuff
		local  newDamage = Combo * Damage
		
		--deal damage
		hum:TakeDamage(newDamage)
		hitSound:Play()
	end
end

local function swing()
	local checkSwing = math.abs(tick() - LastSwing)
	--checking swing stuff
	if (checkSwing > CoolDown) and equipped then
		if checkSwing - CoolDown < 0.2 and Combo < 3 then
			Combo = Combo + 1
		else
			Combo = 1
			
		end
		
		LastSwing = tick()
		canDetect = true
		local humsDetected = {}
		
		local success = pcall(function()
			slashSound:Play()
			--combo checking
			if Combo == 1 then
				--basic attack
				slashTrack:Play()
				
				slashTrack.Stopped:Connect(function()
					canDetect = false
				end)
				
			elseif Combo == 2 then
				--stronger attack
				slash2Track:Play()

				slash2Track.Stopped:Connect(function()
					canDetect = false
				end)
			elseif Combo ==3 then
				--srongest attack
				comboTrack:Play()

				comboTrack.Stopped:Connect(function()
					canDetect = false
				end)
			end
		end)
		
		--hit detetction
		blade.Touched:Connect(function(partHit)
			if not canDetect then return end
			canDetect = false
			
			local isPlayer = game:GetService("Players"):GetPlayerFromCharacter(partHit.Parent)
			local hum = partHit.Parent:FindFirstChild("Humanoid")
			
			for i, v in pairs(humsDetected) do
				if v ==hum.Parent.Name then
					return
				end
			end
			
			--update player hit
			if #humsDetected < 1 then
				table.insert(humsDetected, hum.Parent.Name)
				damage(hum, isPlayer)
			end
		end)
		
		canDetect = success
	end
end

local function equip()
	--Initialize
	player = game:GetService("Players"):GetPlayerFromCharacter(tool.Parent)
	character = player.Character or player.CharacterAdded:Wait()
	humanoid = character:WaitForChild("Humanoid")
	
	--play animation
	pcall(function()
		holdTrack = humanoid:LoadAnimation("holdAnim")
		
	end)
	
	local succsess = pcall(function()
		equipTrack = humanoid:LoadAnimation(equipAnim)
		equipSound:Play()
		
		equipTrack.KeyframeReached:Connect(function(keyframeName)
			if keyframeName == "Pull" then
				equipSound:Play()
			end
		end)
		
		equipTrack.Stopped:Connect(function()
			if tool.Parent.ClassName ~= "Model" then return end
			holdTrack:Play()
		end)
	end)
	
	pcall(function()
		slashTrack = humanoid:LoadAnimation(slashAnim)
	end)
	
	pcall(function()
		slash2Track = humanoid:LoadAnimation(slash2Anim)
	end)
	
	pcall(function()
		comboTrack = humanoid:LoadAnimation(comboAnim)
	end)
	
	equipped = not succsess
end

local function dequip()
	equipped = false
	
	--stop playing sounds
	slashSound:Stop()
	equipSound:Stop()
	
	--stop playing animations
	if holdTrack then
		holdTrack:Stop()
	end
	
	if equipTrack then
		equipTrack:Stop()
	end
	
	if slashTrack then
		slashTrack:Stop()
	end
	
	if slash2Track then
		slash2Track:Stop()
	end
	
	if comboTrack then
		comboTrack:Stop()
	end
end

-- event listeners
tool.Equipped:Connect(equip)
tool.Unequipped:Connect(dequip)
tool.Activated:Connect(swing)