Not a valid member of tool, when it is?

So basically, I made a shop GUI that once you have bought something, it will clone a custom made sword, (it means I made it myself). But the problem is, that it doesn't work with damage in the real game. Here is the script that works with damage.

local canUse = true
local isUsing = false
local isUsingSpecial = false

script.Parent.Activated:connect(function()
    isUsing = true
    wait(0.3)
    isUsing = false
end)

script.Parent.Blade.Touched:connect(function(hit)
        if isUsing == true then
            local random = math.random(1, 2)
            local hum = hit.Parent:WaitForChild("Humanoid")
            hum:TakeDamage(40)
            local stunanim0 = hum:LoadAnimation(script.Stun0)
            local stunanim1 = hum:LoadAnimation(script.Stun1)
            if random == 1 then
                stunanim0:Play()
            elseif random == 2 then
                stunanim1:Play()
            end
            wait(0.2)
            isUsing = false
        elseif script.Parent.isUsingSpecial.Value == true then
            isUsing = false
            local random = math.random(1, 2)
            local hum = hit.Parent.Humanoid
            hum:TakeDamage(20)
            local stunanim0 = hum:LoadAnimation(script.Stun0)
            local stunanim1 = hum:LoadAnimation(script.Stun1)
            if random == 1 then
                stunanim0:Play()
            elseif random == 2 then
                stunanim1:Play()
            end
            wait(0.5)
            script.Parent.isUsingSpecial.Value = false
        elseif script.Parent.isUsingSpecialE.Value == true then
            isUsing = false
            local random = math.random(1, 2)
            local hum = hit.Parent.Humanoid
            hum.WalkSpeed = 0
            hum:TakeDamage(50)
            local stunanim0 = hum:LoadAnimation(script.Stun0)
            local stunanim1 = hum:LoadAnimation(script.Stun1)
            if random == 1 then
                stunanim0:Play()
            elseif random == 2 then
                stunanim1:Play()
            end
            wait(0.5)
            hum.WalkSpeed = 16
            script.Parent.isUsingSpecialE.Value = false

        end

end)

And the output says, "Blade is not a valid member of Tool". (picture under) https://gyazo.com/e70039d4362a6d8f9413113c375013db

Here's the shop script:

local plr = game.Players.LocalPlayer
local replicatedstorage = game:GetService('ReplicatedStorage')
script.Parent.MouseButton1Click:Connect(function()
    if plr.leaderstats.Jewls.Value >= 500 then
        wait(1)
        replicatedstorage.Chronicle:Clone().Parent = plr.Backpack
        plr.leaderstats.Jewls.Value = plr.leaderstats.Jewls.Value - 500

    end
end)

Please help me, because I'm really stuck here. My disc is UnitedDev#5580, if you can't explain it here.