ERROR: Attempt to connect failed: Passed value is not a function?

It's a pet tool. It gives me an error: Attempt to connect failed: Passed value is not a function

local Tool = script.Parent local FluffyHandle = Tool.Handle

local FluffyInstance = nil

local Character = nil

--Destroy Fluffy.
function DestroyFluffy() if not FluffyInstance then return end FluffyInstance:Destroy() FluffyInstance = nil FluffyHandle.Transparency = 0

end

--Create a new Fluffy function CreateFluffy() if FluffyInstance then return end

    --Create a new Part for Fluffy
    FluffyInstance = FluffyHandle:Clone()
    FluffyInstance.Parent = Character.Head
    FluffyInstance.Anchored = true
    FluffyInstance.Name = "Fluffy"

    --Display Fluffy's sparkles
    local FluffySparkles = Instance.new("PointLight")
    FluffySparkles.Parent = FluffyInstance
    FluffySparkles.Color = Color3.new(255,255,255)
    FluffySparkles.Name = "FluffyTrail"
    FluffySparkles.Enabled = false
    FluffySparkles.Range = 8
    FluffySparkles.Brightness = 5
    --Tell Fluffy to orbit
    local FluffyAI = FluffyHandle.Parent.FluffyAIControl:Clone()
    FluffyAI.Parent = FluffyInstance

    FluffyHandle.Transparency = 1.0

end

function onActivated()

    if(Character == nil) then 
        print("Character Nil!")
        return 
    end
    if Tool.Enabled == false then 
        print("Tool Not Ready!")
        return 
    end


    if FluffyInstance then 
        DestroyFluffy()
        return 
    end

    Tool.Enabled = false

    CreateFluffy()

    Tool.Enabled = true

end

function onEquipped() Character = Tool.Parent Tool.Enabled = true Character.Humanoid.Died:connect(onControllerDied) end

function onUnequipped() Tool.Enabled = false Character.Humanoid.Died:connect(nil) Character = nil

end

function onControllerDied() DestroyFluffy()

end

Tool.Activated:connect(onActivated) Tool.Equipped:connect(onEquipped) Tool.Unequipped:connect(onUnequipped)