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When I try to export a wiki page , the browser (Firefox 1.5) complains 
XML Parsing Error: no element found
Location: http://obelix/w/index.php?title=Spezial:Export&action=submit
Line Number 57, Column 1:


When I then check the source file, it is in fact XML, and at its end there is an
error message:
b>Fatal error</b>:  Call to undefined function:  wikierror() in
<b>/opt/mediawiki-1.5.6/includes/SpecialExport.php</b> on line <b>239</b><br />

Error caused by a typo in some error-checking code. :)

You passed an invalid title to Special:Export (for instance with '[' or '<' or 
other forbidden characters).

Fixed in CVS for 1.5.7; already handled properly in 1.6.