What is wrong with this script?

local toolname = "Luger, Colt 45"  
script.Parent.Touched:connect( function(hit)  
    if hit.Parent then 
        local player = Game.Players:GetPlayerFromCharacter(hit.Parent)  
        if player and not player:FindFirstChild("No") then 
            if player.Character:FindFirstChild(toolname) then 
                local gui = player.PlayerGui.StoreRobberyGUI 
                local no = Instance.new("IntValue", player) 
                no.Name = "No" 
                Spawn(function() 
                    wait(10) 
                    no:Destroy() 
                end) 
            end 
        end 
    end 
end)  

I put this in the brick that I needed to touch it, the StoreRobberyGUI is the actual name of the GUI, but when I touch the brick holding one of the guns, it doesn't appear...

You're not doing anything with gui yet as defined on line 7. Does it exist? If so, what's your method of making it appear all of a sudden? Is the visible property already set to false or is the transparency value 1?