Re: : saxon:base64Binary-to-string error!

<xsl:template match="w_binData">
        <xsl:value-of
select="saxon:base64Binary-to-string(xs:base64Binary(normalize-space(.)),
'UTF8')"/> </xsl:template>

Throwing following error:

No license file found - running with licensable features disabled Error at
xsl:value-of on line 94 column 107 of Iwx2Mmx.xsl:
  XPST0017 XPath syntax error at char 0 on line 94 near
{...y(normalize-space(.)), 'UTF...}:
    Cannot find a matching 2-argument function named
  {http://saxon.sf.net/}base64Binary-to-string(). Saxon extension functions
require a
  Saxon-PE or Saxon-EE license
Stylesheet compilation failed: 1 error reported