lua ShroudLoadTexture does not work on MAC

This small shippet of code works fine on windows, but does not work on mac. I couldn't figure out how to attach the image, so just pick any png image and try to use it. (just rename it to black_50.png first).

Code:

local _textureIds = {}

function ShroudOnStart()
    print('ShroudOnStart:begin, path: ' .. ShroudLuaPath)
    _textureIds['black_50'] = ShroudLoadTexture(ShroudLuaPath .. '/black_50.png')
    print('ShroudOnStart:end')
end

function ShroudOnUpdate()
end

function ShroudOnConsoleInput(type, player, message)
end

function ShroudOnGUI()
    ShroudGUILabel(150, 100, 100, 25, 'hello world')
    ShroudGUILabel(150, 125, 100, 100, '<size=400><color=#00000088>█</color></size>')
    ShroudDrawTexture(150, 300, 100, 100, _textureIds['black_50'], StretchToFit)
    ShroudGUILabel(150, 450, 100, 25, 'goodbye world')
end

 

This should be in the Lua API forum, could somebody move it please.