header error saving gallery2 options in WP

Another header problem. I’ve looked at line 15 of admin-header.php and there is no obvious spaces. I deleted out the line and re-typed it, I checked the rest of the file and even though I found a line of white space at the bottom and removed it, I still get the error. I downloaded a new admin-header.php from original install zip – and still get the error. The error occurs when I click on Save Options on the Gallery2 Options screen in WP Options in wp-admin. Any one have any ideas?

Warning: Cannot modify header information – headers already sent by (output started at /home/content/t/h/e/theviolethour/html/wp-admin/admin-header.php:15) in /home/content/t/h/e/theviolethour/html/wp-content/plugins/wp-gallery2/g2admin.php on line 15