проблема с поиском на сайте

[!AjaxSearch? &AS_showForm=`0`!]

[!AjaxSearch?  &AS_landing=`17` &AS_showResults=`0`!]

AjaxSearch error: unknown database_connection_charset = cp1251
Add the appropriate Html charset mapping in the search.class.inc.php file 

    // private variables
    // Conversion code name between html page character encoding and Mysql character encoding
    // Some others conversions should be added if needed. Otherwise Page charset = Database charset
    var $_pageCharset = array('utf8' => 'UTF-8', 'latin1' => 'ISO-8859-1', 'latin2' => 'ISO-8859-2');

('utf8' => 'UTF-8',
 'latin1' => 'ISO-8859-1',
 'latin2' => 'ISO-8859-2',

'cp1251' => 'windows-1251'

 php_mbstring extension required

            if ($this->dbCharset != 'utf8' && !extension_loaded('mbstring')) {
                $msgErr = "AjaxSearch error: php_mbstring extension required";
            } else {
                if ($this->cfg['mbstring']) mb_internal_encoding("UTF-8");

            if ($this->dbCharset == 'utf8' && !extension_loaded('mbstring')) {
                $msgErr = "AjaxSearch error: php_mbstring extension required";
            } else {
                if ($this->dbCharset == 'utf8' && $this->cfg['mbstring']) mb_internal_encoding("UTF-8");