My gui wont enable when i try to open it with a local script?

Im trying to make where you can talk to npcs, im trying to figure out why this local script wont enable the Gui, i added prints too it said it worked, here is the script.

local clickDetector = game.Workspace.yuiigui.ClickDetector
local YuiiGui = game.StarterGui.Yuii
if game.StarterGui.Yuii.Enabled == false then
function onMouseClick()
        print("touched me")
        wait()
        YuiiGui.Enabled = true
        print("it worked")
        end

    clickDetector.MouseClick:connect(onMouseClick)
    end

it is located at StarterPlayerScripts, i have no idea why it wont enable it.