Feed Validation Service

Blank line before XML declaration (WordPress)

If an XML declaration (<?xml ... ?>) appears in your feed, it must be the first thing in the feed, before any whitespace.

Unfortunately, with WordPress it seems all too easy for a plugin, a theme, or for your configuration file to contain a blank line. Further compounding this problem, some — but not all — feed readers compensate for this common error, allowing the error to go undetected for quite a while.

• Check your wp-rss2.php and wp-atom.php files for blank lines outside of <? and ?> bracketed sections.
• Check your wp-config.php file for blank lines outside of <? and ?> bracketed sections.
• Check your theme's functions.php file for blank lines outside of <? and ?> bracketed sections.
• One by one, disable plugins and revalidate until you isolate the one causing the problem.

Let us know on the feedvalidator-users discussion list!