еще одна ошибка

[Slide]

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /var/www/vhosts/sna.intwaywork.com/httpdocs/typo3_src-4.1.5/t3lib/class.t3lib_db.php:796) in /var/www/vhosts/sna.intwaywork.com/httpdocs/typo3_src-4.1.5/typo3/index.php on line 240

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/sna.intwaywork.com/httpdocs/typo3_src-4.1.5/t3lib/class.t3lib_db.php:796) in /var/www/vhosts/sna.intwaywork.com/httpdocs/typo3_src-4.1.5/typo3/template.php on line 618

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /var/www/vhosts/sna.intwaywork.com/httpdocs/typo3_src-4.1.5/t3lib/class.t3lib_db.php on line 796

на странице где распологается форма логин пароль длявхода в админку, выше форму распологается гора ошибок, примерно такого содержания, что это значит? и как ее исправить?