WordPress Speed Up Service | WordPress Website Maintenance Packages rss feed not valid, by stillesbunt hi there. I am currently trying to set up an automated campaign via Mailchimp. Now, the problem is, that my rss feed is not valid. http://www.stillesbunt.at/feed I got it from the source code and already tried to check it via rss feed validator. The error message says: <html> <head> <meta name=”verification” content=”92718abe2c567f575cb7b209e038154a” /> </head> <html> <br /> <b>Warning</b>: Cannot modify header information – headers already sent by (output started at /www/htdocs/w00e984e/index.php:6) in <b>/www/htdocs/w00e984e/wp-includes/pluggable.php</b> on line <b>1210</b><br /> <!– WP Super Cache is installed but broken. The path to wp-cache-phase1.php in wp-content/advanced-cache.php must be fixed! –> Since I am not a Coder and do not want to damage anything, I would appreciate your help! I also cannot reach my website when I type in the url without the “www”. Thank you in advance, Lilly rss feed not valid