I'm building a new site, and have updated the new instance from 4.0 to 4.5. Now my navigation XSLT is throwing errors. My top navigation uses a drop down menu and now isn't working.

The error I receive is:

I think I've narrowed the problem down to this line:

<xsl:with-param name="parent" select="$currentPage/ancestor-or-self::node[@level=1]"/>

I've been searching around the forums trying to find any navigation problems with the same XSLT as mine, but haven't had any success. So I'm not sure how I should write this with the new schema, can anyone help with my XSLT? Thanks in advance.

Below is the full XSLT that I'm using for the top navigation.

<?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"
  exclude-result-prefixes="msxml umbraco.library">


<xsl:output method="xml" omit-xml-declaration="yes"/>

<xsl:param name="currentPage"/>

<!-- update this variable on how deep your navigation should be -->
<xsl:variable name="maxLevel" select="5"/>

<xsl:template match="/">
  <div class="ddsmoothmenu" id="global_nav">
    <ul>
      <xsl:call-template name="drawNodes">  
        <xsl:with-param name="parent" select="$currentPage/ancestor-or-self::node[@level=1]"/>
        
        <!-- THIS CODE IS CAUSING THE ERROR!!!!
        
        <xsl:with-param name="parent" select="$currentPage/ancestor-or-self::node[@level=1]"/>
        
        -->  
      </xsl:call-template>
    </ul>
  </div>
  <xsl:variable name="ddlevel">//ddlevelsmenu.setup("ddtopmenubar", "topbar");</xsl:variable>
  <xsl:value-of select="umbraco.library:RegisterClientScriptBlock('ddlevel', $ddlevel, true())"/>
    </xsl:template>
    <xsl:template name="drawNodes">
      <xsl:param name="parent"/>
      <xsl:if test="umbraco.library:IsProtected($parent/@id,
 $parent/@path) = 0 or (umbraco.library:IsProtected($parent/@id, 
$parent/@path) = 1 and umbraco.library:IsLoggedOn() = 1)">
        <xsl:for-each select="$parent/node
 [string(./data [@alias='topMenu']) = '1' and @level &lt;= $maxLevel
 and (umbraco.library:IsProtected(@id, @path) = false() or 
umbraco.library:HasAccess(@id, @path) = true())]">
          <xsl:variable name="liId">
            <xsl:call-template name="replaceCharsInString">
              <xsl:with-param name="stringIn" select="@nodeName"/>
              <xsl:with-param name="charsIn" select="' '"/>
              <xsl:with-param name="charsOut" select="'_'"/>
            </xsl:call-template>
          </xsl:variable>
          <li>
            <xsl:attribute name="id"><xsl:value-of select="$liId" /></xsl:attribute>
            <a href="{umbraco.library:NiceUrl(@id)}">
              <xsl:if test="$currentPage/ancestor-or-self::node/@id = @id">
                <xsl:attribute name="class">current</xsl:attribute>
              </xsl:if>
              <xsl:if test="count(./node [string(./data [@alias='topMenu']) = '1' and @level &lt;= $maxLevel]) &gt; 0">
                <xsl:attribute name="rel"><xsl:value-of select="@id" /></xsl:attribute>
              </xsl:if>
              <xsl:choose>
                <xsl:when test="./data [@alias = 'topMenuImage'] != ''">
                </xsl:when>
                <xsl:otherwise>
                  <xsl:value-of select="@nodeName"/>
                </xsl:otherwise>
              </xsl:choose>
            </a>  
            <xsl:if test="count(./node [string(./data [@alias='topMenu']) = '1' and @level &lt;= $maxLevel]) &gt; 0">   
              <ul class="ddPageTools_submenustyle" id="{@id}">
                <xsl:call-template name="drawNodes">    
                  <xsl:with-param name="parent" select="."/>
                </xsl:call-template>
              </ul>
            </xsl:if>
          </li>
        </xsl:for-each>
      </xsl:if>
    </xsl:template>
    <xsl:template name="replaceCharsInString">
      <xsl:param name="stringIn"/>
      <xsl:param name="charsIn"/>
      <xsl:param name="charsOut"/>
      <xsl:choose>
        <xsl:when test="contains($stringIn,$charsIn)">
          <xsl:value-of select="concat(substring-before($stringIn,$charsIn),$charsOut)"/>
          <xsl:call-template name="replaceCharsInString">
            <xsl:with-param name="stringIn" select="substring-after($stringIn,$charsIn)"/>
            <xsl:with-param name="charsIn" select="$charsIn"/>
            <xsl:with-param name="charsOut" select="$charsOut"/>
          </xsl:call-template>
        </xsl:when>
        <xsl:otherwise>
          <xsl:value-of select="$stringIn"/>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:template>

</xsl:stylesheet>