What is wrong of this and fix it

[Dot Shee lan]

{$CLEO}

thread 'GET_SCREEN_POSITIONS' 

while true 
    wait 0 
    if is_player_playing($PLAYER_CHAR) 
        if does_text_label_exist(0x1234) 
            posX, posY = get_text_label_coords(0x1234) 
            screenX, screenY = get_screen_xy_from_world_coords(posX, posY, 0.0) 
            print_with_number("Label position on screen: x = %d, y = %d", screenX, screenY) 
        end 
    end 
end