Thread:Extension talk:Pdf Export/Error after upgrade to MediaWiki 1.21.0

After uploading to MediaWiki 1.21.0 I get following error (due to API changes, I think): PHP Fatal error: Call to undefined function wfLoadExtensionMessages in /srv/www/htdocs/wiki/extensions/PdfExport/PdfExport.php on line 83 Any quick fix available?