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Wordpress XML Parsing Error

XML Parsing Error: XML or text declaration not at start of entity

> Warning: MagpieRSS: Failed to parse RSS file. (Reserved XML Name at
> line 3, column 38) in [...]
>
> Warning: Invalid argument supplied for foreach() in [...]

Yesterday it was called to my attention that the RSS parser that was pulling the feed from my blog into my web site was throwing some rather nasty errors. Upon further investigation I discovered that the feed itself was the culprit.

Something was throwing in extra white space before the document declaration in the XML file. Some people have found that old plug-ins or themes can cause this problem. I searched through every PHP file and finally found the issue in my config (wp-conifg.php) file.

I just updated to the latest version of WordPress yesterday and when updating the config with the most recent settings, I accidentally added two empty lines before the opening PHP tag.

Ooops. Thanks to Jared over at ShareBrained Technologies for noticing!