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)