Problem using Saxon extension

Hi,
when I try to use Saxon extension to generate barcode in SVG format
during XSLT Transformation, I get the following error :
Error at barcode:barcode on line 429 of file ....
            Unknokn extension element
Transformation failes: Run-time errors were reported

However I follow all the instructions for the Saxon extension :
1) set the classpath
2) add xmlns:barcode=

"http://www.krysalis.org/barcode/org.krysalis.barcode.saxon.BarcodeExtensionElementFactory"

    extension-element-prefixes="barcode">
3) insert <fo:block>
    <fo:instream-foreign-object>
      <barcode:barcode message="{msg}">
        <barcode:code128>
          <barcode:height>8mm</barcode:height>
        </barcode:code128>
      </barcode:barcode>
    </fo:instream-foreign-object>
  </fo:block>
in my code.

What is the matter ?



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