HELP! Custom Post Types

I’ve been having a lot of problems with Custom Post Types…currently, adding new meta boxes seems to work until i push “update”

Then I get

Warning: Cannot modify header information – headers already sent by (output started at /homepages/32/d341331375/htdocs/wp/wp-content/themes/IQ Materials/functions.php:58) in /homepages/32/d341331375/htdocs/wp/wp-includes/pluggable.php on line 890

insight, anyone?

The code I’m using is from voosh themes.