Whats the problem with the chat tool script?

So I'm trying to make it so when I equip the tool, it will show up a gui. When you close it, it'll remove the gui. I don't know whats wrong so could anyone help? Thanks.

local tool = script.Parent -- Make sure that this script is in your tool 
local gui = game.ServerStorage.Chat
local player = game.Players.LocalPlayer
tool.Equipped:connect(function(mouse) 
    local guiclone = gui:Clone() 
    guiclone.Parent = player.PlayerGui-- assuming you already have "player" defined 
	game.StarterGui:SetCoreGuiEnabled(3, true)
end) 

tool.Unequipped:connect(function() 
    if player.PlayerGui:findFirstChild("Chat") then 
        player.PlayerGui:findFirstChild("Chat"):Destroy() -- removes "Gui" 
		game.StarterGui:SetCoreGuiEnabled(3, false)
    end 
end)