Error:Cannot Modify Header Information

When I tried to create the database I got this err
Warning: Cannot modify header information - headers already sent by (output started at /www/serverocean.com/b/r/u/brutallyhonest/htdocs/blog/wp-admin/setup-config.php:23) in /www/serverocean.com/b/r/u/brutallyhonest/htdocs/blog/wp-includes/wp-db.php on line 373