I just installed WordPress SEO and immediately got the following error message:
Warning: Cannot modify header information - headers already sent by (output started at /home/bluweb/public_html/youtubemarketingtips.com/market/wp-admin/includes/template.php:1642) in /home/bluweb/public_html/youtubemarketingtips.com/market/wp-includes/pluggable.php on line 876
This does not apparently affect how my site works, but then something must not be working properly somewhere if I get this message. Being somewhat of a newbie, I don't know what this means, where to look or what to do to fix it. Can you help?