Hi I am getting an error whenever I try to access my cpanel as listed below but not sure how to corrected it
<b>Warning</b>: Cannot modify header information - headers already sent by (output started at /home/janicedj/public_html/bizsuccesstoday.net/wp-content/plugins/wordpress-ping-optimizer/cbnet-ping-optimizer.php:620) in <b>/home/janicedj/public_html/bizsuccesstoday.net/wp-includes/feed-rss2.php</b> on line <b>8</b>
when I checked it on http://www.ismybloworking itt told me something was wrong with the rss feed and sent me to feedvalidator which gave me this message.
This feed does not validate.
line 2, column 0: Undefined root element: br [help]
line 3, column 0: XML parsing error: <unknown>:3:0: junk after document element [help]
<b>Warning</b>: Cannot modify header information - headers already sent by ...
In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendation.
Feeds should not be served with the "text/html" media type [help]
I dont know what all of this means