Hi,

Im trying to create an xslt macro with the help of dandrayne to check whether the user is logged in or not. If they are logged in they can post comments to a blog post, but if not it will require them to login. How ever I cant find what I'm doing wrong.

Here is the error:

Error occured
System.NullReferenceException: Object reference not set to an instance of an object. 
at umbraco.BusinessLogic.StateHelper.GetCookieValue(HttpContext context, String key) 
at umbraco.BusinessLogic.StateHelper.HasCookieValue(String key) 
at umbraco.cms.businesslogic.member.Member.CurrentMemberId() 
at umbraco.cms.businesslogic.member.Member.IsLoggedOn() 
at umbraco.library.IsLoggedOn()

Here is the xslt code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>
<xsl:stylesheet 
 version="1.0" 
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
 xmlns:msxml="urn:schemas-microsoft-com:xslt"
 xmlns:umbraco.library="urn:umbraco.library" xmlns:Exslt.ExsltCommon="urn:Exslt.ExsltCommon" xmlns:Exslt.ExsltDatesAndTimes="urn:Exslt.ExsltDatesAndTimes" xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath" xmlns:Exslt.ExsltRegularExpressions="urn:Exslt.ExsltRegularExpressions" xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings" xmlns:Exslt.ExsltSets="urn:Exslt.ExsltSets" xmlns:MailEngine="urn:MailEngine" xmlns:pdcalendar="urn:pdcalendar" xmlns:Designit.VideoEmbed="urn:Designit.VideoEmbed" xmlns:tagsLib="urn:tagsLib" xmlns:BlogLibrary="urn:BlogLibrary" 
 exclude-result-prefixes="msxml umbraco.library Exslt.ExsltCommon Exslt.ExsltDatesAndTimes Exslt.ExsltMath Exslt.ExsltRegularExpressions Exslt.ExsltStrings Exslt.ExsltSets MailEngine pdcalendar Designit.VideoEmbed tagsLib BlogLibrary ">
 

<xsl:output method="xml" omit-xml-declaration="yes"/>
<xsl:param name="currentPage"/>
<xsl:template match="/">
<xsl:variable name="loggedInTemplate" select="2387" />
<xsl:variable name="loggedOutTemplate" select="2388" />
<xsl:variable name="currentId" select="$currentPage/@id" />        
<xsl:choose>                
 <xsl:when test="umbraco.library:IsLoggedOn()">                  
  <xsl:value-of select="umbraco.library:RenderTemplate($currentId,$loggedInTemplate)" disable-output-escaping="yes" />                
 </xsl:when>                
 <xsl:otherwise>                        
  <xsl:value-of select="umbraco.library:RenderTemplate($currentId,$loggedOutTemplate)" disable-output-escaping="yes" />                
 </xsl:otherwise>        
</xsl:choose>
</xsl:template>
</xsl:stylesheet>