خطای Database Error: Unable to load Database Driver: mysqli

[behinam]

سایت با خطای زیر مواجه است:
Database Error: Unable to load Database Driver: mysqli
اطلاعات فایل config:
<?php
class JConfig {
public $MetaAuthor = '1';
public $MetaRights = '';
public $MetaTitle = '1';
public $MetaVersion = '0';
public $access = '1';
public $cache_handler = 'file';
public $cachetime = '15';
public $caching = '0';
public $captcha = '0';
public $cookie_domain = '';
public $cookie_path = '';
public $db = 'hanakhabar_hana';
public $dbprefix = 'nxz67_';
public $dbtype = 'mysqli';
public $debug = '0';
public $debug_lang = '0';
public $display_offline_message = '1';
public $editor = 'jce';
public $error_reporting = 'none';
public $feed_email = 'author';
public $feed_limit = '10';
public $password = 'xxxxxxx';
public $host = 'localhost';
public $force_ssl = '0';