Problem creating barcodes with xsl:fo

Hi,

I want to create a barcode with xsl:fo. When I follow the recipe given in
http://www.krysalis.org/barcode/xsl-fo.html I get the following error.
Can someone explain to me what I am doing wrong?

Thanks,
Erwin


Error message:
XSLT-Fehler (javax.xml.transform.TransformerException): java.lang.NoSuchMethodException: For extension function, could not find method org.apache.xml.dtm.ref.DTMNodeIterator.generate([ExpressionContext,] #STRING).

..............................

Erwin Kloeck
Produktentwicklung

Oestreicher + Wagner 
Medientechnik GmbH
Frankenthaler Strasse 20
D-81539 Muenchen

Fon   +49 (0)89-68961 216 
Fax   +49 (0)89-68961 271



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