Error message

• Warning: ini_set(): Session save handler "user" cannot be set by ini_set() in include_once() (line 163 of sites/default/settings.php).
• Warning: session_set_save_handler(): Session save handler cannot be changed after headers have already been sent in drupal_session_initialize() (line 245 of includes/session.inc).
• Warning: session_id(): Session ID cannot be changed after headers have already been sent in drupal_session_initialize() (line 269 of includes/session.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/u3042741/data/www/falt.su/sites/all/modules/rules/rules.module:542) in drupal_send_headers() (line 1558 of includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/u3042741/data/www/falt.su/sites/all/modules/rules/rules.module:542) in drupal_send_headers() (line 1558 of includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/u3042741/data/www/falt.su/sites/all/modules/rules/rules.module:542) in drupal_send_headers() (line 1558 of includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/u3042741/data/www/falt.su/sites/all/modules/rules/rules.module:542) in drupal_send_headers() (line 1558 of includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/u3042741/data/www/falt.su/sites/all/modules/rules/rules.module:542) in drupal_send_headers() (line 1558 of includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/u3042741/data/www/falt.su/sites/all/modules/rules/rules.module:542) in drupal_send_headers() (line 1558 of includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/u3042741/data/www/falt.su/sites/all/modules/rules/rules.module:542) in drupal_send_headers() (line 1558 of includes/bootstrap.inc).