Problem with validating Gallery 2

I am getting the following errors while validating WPG2. Can anyone offer a little bit of help? I’d certainly appreciate it.

Warning: Cannot modify header information – headers already sent by (output started at /home/.urchin/socalled/mysocalledfabulouslife.com/wp-admin/admin-header.php:8) in /home/.urchin/socalled/mysocalledfabulouslife.com/gallery2/main.php on line 30

Fatal error: Call to undefined function: galleryinitfirstpass() in /home/.urchin/socalled/mysocalledfabulouslife.com/gallery2/modules/core/classes/GalleryEmbed.class on line 80