Why does FE not let Button1Down() fire?

Hello, first thanks for reading this. So I am using the wiki tutorial on making a raycast gun but I run the code with FE turned on and the Button1Down() function won't fire. I am trying to figure out how to make my own. I don't want someone to tell me what to do. But if you could point me in the right direction of fixing the problem it would be appreciated. :-)

local tool = script.Parent
local player

tool.Equipped:connect(function(mouse)
    player = game.Players:FindFirstChild(script.Parent.Parent.Name)
    print("Tool equipped!")

    mouse.Button1Down:connect(function()
        print("Mouse pressed!")
        local ray = Ray.new(tool.Handle.CFrame.p, (mouse.Hit.p - tool.Handle.CFrame.p).unit * 300)
        local part, position = workspace:FindPartOnRay(ray, player.Character, false, true)

        local beam = Instance.new("Part", workspace)
        beam.BrickColor = BrickColor.new("Bright red")
        beam.FormFactor = "Custom"
        beam.Material = "Neon"
        beam.Transparency = 0.25
        beam.Anchored = true
        beam.Locked = true
        beam.CanCollide = false

        local distance = (tool.Handle.CFrame.p - position).magnitude
        beam.Size = Vector3.new(0.3, 0.3, distance)
        beam.CFrame = CFrame.new(tool.Handle.CFrame.p, position) * CFrame.new(0, 0, -distance / 2)

        game:GetService("Debris"):AddItem(beam, 0.1)

        if part then
            local humanoid = part.Parent:FindFirstChild("Humanoid")

            if not humanoid then
                humanoid = part.Parent.Parent:FindFirstChild("Humanoid")
            end

            if humanoid then
                humanoid:TakeDamage(30)
            end
        end
    end)
end)