Session Error

Hello, please tell me what kind of error session out on the website, from unauthorized users and registred users. How can I fix this error?

Notice: Undefined index: settings in /var/www/rio4/data/www/rio001.com/app/Tygh/Session.php on line 257

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/rio4/data/www/rio001.com/app/Tygh/Session.php:257) in /var/www/rio4/data/www/rio001.com/app/Tygh/Web/Session.php on line 333

Здравствуйте, подскажите пожалуйста, что за ошибка сессии выходит на сайте, у неавторизованных пользователей и у авторизованных пользователей. Как можно исправить данную ошибку?

Notice: Undefined index: settings in /var/www/rio4/data/www/rio001.com/app/Tygh/Session.php on line 257

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/rio4/data/www/rio001.com/app/Tygh/Session.php:257) in /var/www/rio4/data/www/rio001.com/app/Tygh/Web/Session.php on line 333

Hello,

It seems you have a problem with the encoding of your session settings. If you want, you can contact us for support at sales@poppedweb.com

Kind regards,