another "Cannot modify header information" issue

I know, there’s a lot of these out there. Mine is an issue when my blog’s rss feed link is used to subscribe. I have replaced the file with a fresh copy, and looked for white space and comments not closed. No luck. Here is the error and the line it mentions, can anyone suggest anything? Anyone need the whole file, let me know. Thanks:

Warning: Cannot modify header information – headers already sent by (output started at /mnt/r0105/d14/s00/b0331e39/www/e-nichedeals.com/blog/index.php:2) in /mnt/r0105/d14/s00/b0331e39/www/e-nichedeals.com/blog/wp-includes/feed-rss2.php on line 7

header(‘Content-Type: ‘ . feed_content_type(‘rss-http’) . ‘ charset=’ . get_option(‘blog_charset’), true);