It's due to your PHP setting. Please firstly find the file "php.ini", suppose you are using Windows NT, then open c:winntphp.ini, find the [session] part and modify that part to the following: [Session] ; Handler used to store/retrieve data. session.save_handler = files ; Argument passed to save_handler. In the case of files, this is the path ; where data files are stored. session.save_path = C:PHPsessiondata ; argument passed to save_handler ; Whether to use cookies. session.use_cookies = 1 ; Name of the session (used as cookie name). session.name = PHPSESSID ; Initialize session on request startup. session.auto_start = 0 ; Lifetime in seconds of cookie or, if 0, until browser is restarted. session.cookie_lifetime = 0 ; The path for which the cookie is valid. session.cookie_path = / ; The domain for which the cookie is valid. session.cookie_domain = ; Handler used to serialize data. php is the standard serializer of PHP. session.serialize_handler = php Note: Please make sure that the directory "C:PHPsessiondata" is existing in your system. We recommend that you should visit www.php.net for more information about your problem.