[Phpwiki-talk] Error: XML cannot be displayed

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One of my PHPWiki's, displays a message "The XML page cannot be 
displayed".  If you do refresh, the page shows fine and from now on it 
all works.  The error is only the first time per session.  Any ideas?
Stan Berka

----- The complete error message:

The XML page cannot be displayed
Cannot view XML input using XSL style sheet. Please correct the error 
and then click the Refresh button, or try again later.

--------------------------------------------------------------------------------

Cannot have a DOCTYPE declaration outside of a prolog. Error processing 
resource 'http://www.saintclarechurch.org/phpwiki/index.php'. Line 4, 
Position 11

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
----------^

----- end