ClickDetector non existent when playing online?

Hey, so my script places a GUI on a wall that someone has placed down once clicked on in case they would like to destroy it or they've misplaced it. Everything goes to plan and works fine when i'm playing in studio, but what it comes to playing online, the console says the ClickDetector does not exist in the part?

enabled = 1

script.Parent.ClickDetector.MouseClick:connect(function(playerWhoClicked)
    if enabled == 1 then
    if script.Parent.Parent.Parent.Parent.Name == (playerWhoClicked.Name.."'s House") then
        local Gui = game.Lighting.DestroyBlock
        Gui:Clone().Parent=script.Parent
        wait(0.5)
        enabled = 0
    end
    else if enabled == 0 then
        script.Parent.DestroyBlock:Destroy()
        wait(0.5)
        enabled = 1
        end
    end 
end)