[dgs problem]

Hello. I created a test hud and i added a button using dgs. The problem is, when i add that button, the script doesn't show nothing. If i delete all the lines where i use this language, the hud is showing normally. I'm new in this language and i don't know exactly how to use another languages than the default. I used a hud downloaded from resources section as an example.

Code:

loadstring(exports.dgs:dgsImportFunction())()
loadstring(exports.dgs:dgsImportOOPClass(true))()

local screensize = Vector2(guiGetScreenSize())
local buttonsize = Vector2(100, 50)
local windowsize = Vector2(400, 400)
local windowfinal = Vector2(screensize.x/2 - windowsize.x/2, screensize.y/2 - windowsize.y/2)
local buttonfinal = Vector2(screensize.x/2 - buttonsize.x/2, screensize.y/2 - buttonsize.y/2)

function paneltest()
    dxDrawImage(windowfinal.x, windowfinal.y, windowsize.x, windowsize.y, 'panels/window.png', 0, 0, 0, tocolor(255, 255, 255, 150), false)
    dxDrawImage(windowfinal.x, windowfinal.y, windowsize.x, windowsize.y, 'panels/window2.png')
    dgsCreateButton(buttonfinal.x, buttonfinal.y, buttonsize.x, buttonsize.y, "Test", true)
    dxDrawText("JobInfo", windowfinal.x+180, windowfinal.y)
end

addEventHandler("onClientRender", root,
    function()
        paneltest()
    end
)

meta.xml:

<meta>
    <info author="matei123" type="script" version="1.0.0" />
    <script src="code.lua" type="server" />
    <script src="gui.lua" type="client" />

    <file src='panels/window.png' />
    <file src='panels/window2.png' />
</meta>