Fatal error: Call to undefined method mysql::addNews()

<?php
class mysql{
public $mysql_base;
public $connect;
function __construct()
{
    session_start();
    
    include("config.php");
    
    $this->mysql_base = $mysql_base;
    
    $this->connect = mysql_connect($mysql_host,$mysql_login,$mysql_password) or exit(mysql_error());
    
    mysql_select_db($mysql_base) or exit(mysql_error());
    
    mysql_query("set_client='utf8'");
 
    mysql_query("set character_set_results='utf8'");
 
    mysql_query("set collation_connection='utf8_general_ci'");
 
    mysql_query("set NAMES utf8");
}
function addNews($title, $disc, $screen)
{
    $SQL = "INSERT INTO `".$this->mysql_base."`.`news` (`id`, `title`, `discription`, `screenshot`, `date`, `look`, `whoLook`) VALUES (NULL, '".$title."!', '".$disc."', '".$screen."', '".time()."', '0', '');";
    mysql_query($SQL) or die(mysql_error());
    $q = mysql_fetch_array(mysql_query("SELECT * FROM `news` ORDER BY `id` DESC LIMIT 1;"));
    return $q['id'];
}
 
 
}
?>

<?php
    require_once($_SERVER['DOCUMENT_ROOT']."/lib/include/setting_page.php");
    include_once($_SERVER['DOCUMENT_ROOT']."/lib/include/mysql.php");
    include_once($_SERVER['DOCUMENT_ROOT']."/lib/include/custom.php");
    $mysql = new mysql();
        $news_title = Filters($_POST['news_title']);
    $news_discription = Filters($_POST['news_discription']);
    $news_screen = Filters($_POST['news_screen']);
    $id = $mysql->addNews($news_title, $news_discription, $news_screen);
    header("Location: /news/".$id."/");
?>

Fatal error: Call to undefined method mysql::addNews() in N:\home\localhost\www\lib\tamplate\addnews.php on line 16

$id = $mysql->addNews($news_title, $news_discription, $news_screen);