Cannot find a matching 1-argument function named - xslt

Question

I have the following XSLT and using Stylus. No matter what I do I get the following error message for Line number 50.
Cannot find a matching 1-argument function named {http://schemas.microsoft.com/BizTalk/2003/userCSharp}ReplaceYYYMMDDtoXsdDate()
encoding="UTF-8" at the does not help.
Adding msxsl:assembly and msxsl:using do not help
Appreciate hints and help.
Regards, Toraj
<?xml version='1.0' ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" xmlns:var="http://schemas.microsoft.com/BizTalk/2003/var" exclude-result-prefixes="msxsl var s0 userCSharp ScriptNS0" version="1.0" xmlns:ns0="http://schemas.microsoft.com/dynamics/2008/01/documents/AdecPOItemArrival"
xmlns:st="http://schemas.microsoft.com/dynamics/2008/01/sharedtypes" xmlns:s0="http://schemas.microsoft.com/BizTalk/EDI/X12/2006" xmlns:userCSharp="http://schemas.microsoft.com/BizTalk/2003/userCSharp" xmlns:ScriptNS0="http://schemas.microsoft.com/BizTalk/2003/ScriptNS0">
<xsl:output indent="yes" omit-xml-declaration="yes" method="xml" version="1.0" />
<xsl:strip-space elements="*" />
<xsl:template match="/">
<xsl:apply-templates select="s0:X12_00401_856" />
</xsl:template>
<!-- Use the following inside BizTalk Scripting Fuctoid - Start -->
<xsl:template name="CopyOrderTemplate" match="s0:X12_00401_856" xmlns:s0="http://schemas.microsoft.com/BizTalk/EDI/X12/2006">
<xsl:copy>
<xsl:apply-templates select="s0:HLLoop1[.//HL03/text()='O']" />
</xsl:copy>
</xsl:template>
<xsl:template name="WMSJournalTableTemplate" match="s0:HLLoop1[.//HL03/text()='O']">
<ns0:WMSJournalTable class="entity" Number="{.//PRF01}">
<xsl:apply-templates select="following-sibling::s0:HLLoop1[.//HL03/text()='I'][generate-id(preceding-sibling::s0:HLLoop1[.//HL03/text()='O'][1])=generate-id(current())]" />
</ns0:WMSJournalTable>
</xsl:template>
<xsl:template name="WMSJournalTransTemplate" match="s0:HLLoop1[.//HL03/text()='I']">
<ns0:WMSJournalTrans class="entity" Number="{.//LIN01}">
<xsl:variable name="Qty" select="s0:SN1/SN102/text()" />
<ns0:Qty>
<xsl:value-of select="$Qty" />
</ns0:Qty>
<xsl:variable name="TestData" select="../s0:DTM/DTM02/text()" />
<ns0:TestDataTst>
<xsl:value-of select="$TestData" />
</ns0:TestDataTst>
<!-- From BizTalk Validate XSLT
<xsl:variable name="var:v29" select="userCSharp:ReplaceYYYMMDDtoXsdDate(string(../../../s0:DTM/DTM02/text()))" /> -->
<!-- <xsl:variable name="var:v29" select="userCSharp:ReplaceYYYMMDDtoXsdDate(string(../s0:DTM/DTM02/text()))"/> -->
<xsl:variable name="var:v29" select="userCSharp:ReplaceYYYMMDDtoXsdDate($TestData)" />
<ns0:TransDate>
<xsl:value-of select="$var:v29" />
</ns0:TransDate>
<xsl:variable name="VendAccount" select="'13458'" />
<ns0:VendAccount>
<xsl:value-of select="$VendAccount" />
</ns0:VendAccount>
</ns0:WMSJournalTrans>
</xsl:template>
<msxsl:script language="C#" implements-prefix="userCSharp">
<!-- <msxsl:script implements-prefix='userCSharp' language='C#'>
<msxsl:assembly href="C:\Users\toraj.khavari\Documents\StylusProjects\856\Adec.Common.Modification.dll"/>
<msxsl:using namespace="Adec.Common.Modification" />
<msxsl:using namespace="System" />-->
<![CDATA[
/// <summary>
/// Replaces the yyyymmddd date to XSD date.
/// </summary>
/// <param name="stringInput">The string input.</param>
/// <returns></returns>
public string ReplaceYYYMMDDtoXsdDate(string stringInput)
{
System.String resultStr = "NotFound";
string year = null;
string month = null;
string day = null;
try
{
if (!System.String.IsNullOrEmpty(stringInput) && (stringInput.Length > 7))
{
// IsDigitsOnly
foreach (char c in stringInput)
{
if (c < '0' || c > '9')
return resultStr = "Invalid Input string values";
}
year = stringInput.Substring(0, 4);
month = stringInput.Substring(4, 2);
day = stringInput.Substring(6, 2);
resultStr = String.Format("{0}-{1}-{2}", year, month, day);
}
else
{
resultStr = "Invalid Input string values";
}
}
catch
{
resultStr = "ExceptionError in ReplaceYYYMMDDtoXsdDateTime";
}
return resultStr;
}
]]>
</msxsl:script>
<!-- Use the bove inside BizTalk Scripting Fuctoid - END -->
</xsl:stylesheet>
Code attached

Answer 1

Well msxsl:script is a proprietary Microsoft feature implemented in some XSLT 1.0 processor by Microsoft like the various MSXML version (which however don't support calling into .NET languages like C#, you can only call VBScript or JScript extension functions) or like XslCompiledTransform. I don't know which XSLT processors you can use with Stylus Studio but I think by default it uses Saxon and that does not support the Microsoft specific extension to call into C#. So you will need to check whether Stylus Studio allows you to switch to Microsoft's XslCompiledTransform as the XSLT processor.