最近買了一組板型更新後發現，會出現session的問題，無法重導到正常畫面!!!!

我是新手，最近買了一組板型更新後發現，會出現session的問題如下:
warning: Cannot modify header information - headers already sent by (output started at C:\TWPD\htdocs\drupal-6.2\themes\theme030\template.php:81) in C:\TWPD\htdocs\drupal-6.2\includes\session.inc on line 101.
warning: session_regenerate_id() [function.session-regenerate-id]: Cannot regenerate session id - headers already sent in C:\TWPD\htdocs\drupal-6.2\includes\session.inc on line 104.

請老手們幫我看看問題在何處，謝謝!