Few days ago I found error from my Netvibes home page. I click the feed button and I found below error.
XML Parsing Error: xml declaration not at start of external entity
Line Number 8, Column 1:
It got worse later on. Clicking feed button gives me
Fatal error: Call to undefined function: wp() in /home/sfong/public_html/me/wp-rss2.php on line 5
Validation result shows "XML parsing error: :8:0: xml declaration not at start of external entity ".
I traced that xml file is generated by a file in the WP1.5.2 installation called wp-rss2.php and this file requires wp-blog-header.php, files that I never touch so why suddenly it failed to work?
Strangely enough my other site, which is also on WP1.5.2, WP Playground is suffering from the same problem. But WP 2.0, also has been upgraded to 2.0, is OK
There appears to be similar problem encountered by other members in forum, see this post.