For extension function, could not find method ru.bitel.common.Utils.replace([ExpressionContext,] #STRING, #STRING, #STRING)

7-20/13:23:44 ERROR [http-bio-0.0.0.0-8443-exec-2] XSLManager - error transform; SystemID: file:/opt/BGBillingServer_7_0/webroot/xsl/egs_bill_pdf_my_.xsl; Line#: 465; Column#: 186 javax.xml.transform.TransformerException: java.lang.NoSuchMethodException: For extension function, could not find method ru.bitel.common.Utils.replace([ExpressionContext,] #NODESET, #STRING, #STRING).

<xsl:variable
  name="abon_service"
  select="utils_r:replace(sql:select( concat( 'SELECT FORMAT(SUM(summa),2) AS sum FROM ', $npay_detail_table, ' WHERE sid=',$service_abon_service, $id_filter ) )/row/@sum, ',', '')"/>

<xsl:stylesheet
        version="1.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns:fo="http://www.w3.org/1999/XSL/Format"
        xmlns:svg="http://www.w3.org/2000/svg"
        xmlns:xalan="http://xml.apache.org/xalan"
        xmlns:sql="bitel.billing.server.util.exslt.SQLQuery"
        xmlns:utils="bitel.billing.server.util.Utils"
        xmlns:utils_r="ru.bitel.common.Utils"

public static String replace( String value, String from, String to )
    {
        return value.replace( from, to );
    }