[Phpwiki-talk] Opening a new session problem

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When opening the PhpWiki page for the first time with Mozilla 1.2.1, the 
following problem is reported at the top of the page by Wiki (IE shows 
only erro message-see below):

<div class="error"><p>lib/Request.php:136: Warning[2]: ob_start(): 
output handler 'ob_gzhandler' cannot be used after 'URL-Rewriter'</p>
</div>

Here's what I have found on Google:
Error: "ob_start(): output handler 'ob_gzhandler' cannot be used after
'URL-Rewriter'"
Reason: You call ob_start('ob_gzhandler'); after session_start hs been 
called and trans_sid is used.
Solution: Call ob_start('ob_gzhandler'); before session_start().

I have no idea how to apply this "advice". I don't know PHP and also it 
might be more a configuration problem rather than a code bug. Please, help.

IE: 6.0 on WinME
OS: Red Hat Linux
PHP: 4.3.4
MySQL: 4.0.15-stand
PhpWiki: 1.3.4

If I use IE 6.0 instead of Mozilla, the message is even more cryptic:
 >>> Error reported by IE:
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 Error