Warning: session_start() [function.session-start]: Cannot send session cache limiter — headers already sent (output started at /home/csgood01/domains/cs-good.ru/public_html/classes/modules/user/mapper/User.mapper.class.php:1) in /home/csgood01/domains/cs-good.ru/public_html/classes/modules/sys_session/Session.class.php on line 53

Как исправить?