Fatal error: Call to a member function connect() on a non-object in

<?php
 
 
 
 @ob_start();
@session_start();
error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);
ini_set('display_errors', TRUE);
ini_set('html_errors', FALSE);
date_default_timezone_set('Europe/Moscow');
header('Content-Type: text/html; Charset=UTF-8');
define('DIR', dirname(__FILE__));
define('ENGINE', DIR . '/engine');
define('DATA', ENGINE . '/data');
define('CLASSES', ENGINE . '/classes');
define('MODULES', ENGINE . '/modules');
define('COMPONENTS', ENGINE . '/components');
define('SCRIN', true);
include ENGINE . '/config.php';
include CLASSES . '/mysqli.php';
include CLASSES . '/functions.php';
include DATA . '/config.php';
$func = null;
$mcache = null;
$mcache->connect('localhost', 11211);
$time = null;
 
if (!empty($_GET['ref'])) {
    $ref_id = null;
    $check_ref = null;
 
    if (!empty($check_ref['user_id'])) {
        $referer = null;
        SetCookie('referer', $referer, time() + (7 * 24 * 3600));
    }
}
 
$add_money = null;
 
while ($add_m = null) {
    $de_id = null;
    $dep_sum = $add_m['dep_sum'] * $add_m['dep_x'];
    $us_id = null;
 
    if ($add_m['dep_system'] == 'pm') {
        $db->query('UPDATE `users` SET `user_money_p`=user_money_p+\'' . $dep_sum . '\' WHERE `user_id`=\'' . $us_id . '\'');
    } else {
        $db->query('UPDATE `users` SET `user_money_l`=user_money_l+\'' . $dep_sum . '\' WHERE `user_id`=\'' . $us_id . '\'');
    }
 
    $db->query('UPDATE `dep_us` SET `dep_end`=\'1111111111\' WHERE `de_us`=\'' . $de_id . '\'');
    $db->query('UPDATE `stat` SET `info`=info-\'1\' WHERE `st_id`=\'4\'');
    $db->query('UPDATE `stat` SET `info`=info+\'1\' WHERE `st_id`=\'5\'');
}
 
if (!empty($GLOBALS['_SESSION']['user_id'])) {
    $user_info = $mcache;
    $user_email = null;
 
    if (empty($user_info['user_id'])) {
        exit('Такого пользователя не существует!');
    }
 
    $user_id = null;
    $user_pm = $ref_id;
    $user_money_p = null;
    $user_money_l = 'SELECT `user_id` FROM `users` WHERE `user_id`=\'' . $ref_id . '\'';
    $user_login = $check_ref;
 
    if ($user_id == $admin_id) {
        $user_status = 536;
    } else {
        $user_status = 537;
    }
} else {
    $user_status = 535;
}
 
$page = (!empty($_GET['page']) ? $_GET['page'] : 'index');
include COMPONENTS . '/page.php';
$content = $add_money;
ob_end_clean();
include DIR . '/tpl/header.php';
echo $content;
include DIR . '/tpl/footer.php';
?>