    public static function error ($vars="", $val='') {
        if( isset($vars) && $vars != "" ) {
            include(GX_PATH.'/inc/lib/Control/Error/'.$vars.'.control.php');
        }else{
            include(GX_PATH.'/inc/lib/Control/Error/unknown.control.php');
        }
    }
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.