Umbraco 4.8.1

I am trying to get var "url" into our for-each, where it's currently "select="$currentPage/*/* "

The purpose of the XSLT is to create a macro that lists the blogs we have on our site, and use that macro in the master page. At this stage the makro is functional, but only at the homepage.

Currently we're getting this error:

Error occured
System.OverflowException: Værdien var enten for stor eller for lille til en Int32. 
ved System.Convert.ToInt32(Double value) 
ved System.Double.System.IConvertible.ToInt32(IFormatProvider provider) 
ved System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) 
ved System.Xml.Xsl.Runtime.XmlQueryRuntime.ChangeTypeXsltArgument(XmlQueryType xmlType, Object value, Type destinationType) 
ved System.Xml.Xsl.Runtime.XmlQueryContext.InvokeXsltLateBoundFunction(String name, String namespaceUri, IList`1[] args) 
ved url(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime) 
ved Execute(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime) 
ved System.Xml.Xsl.XmlILCommand.Execute(Object defaultDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlSequenceWriter results) 
ved System.Xml.Xsl.XmlILCommand.Execute(Object defaultDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlWriter writer) 
ved System.Xml.Xsl.XslCompiledTransform.Transform(IXPathNavigable input, XsltArgumentList arguments, XmlWriter results, XmlResolver documentResolver) 
ved System.Xml.Xsl.XslCompiledTransform.Transform(IXPathNavigable input, XsltArgumentList arguments, TextWriter results) 
ved umbraco.presentation.webservices.codeEditorSave.SaveXslt(String fileName, String oldName, String fileContents, Boolean ignoreDebugging)

<xsl:variable name="documentTypeAlias" select="string('Blog')"/>
<xsl:variable name="numberOfPosts" select="4"/>
<xsl:variable name="url" select="umbraco.library:NiceUrl($currentPage/data[@alias='Subpage'])"/>

<xsl:template match="/">
<!-- The fun starts here -->
<ul>

  <xsl:for-each select="$currentPage/*/*[name() = $documentTypeAlias and string(umbracoNaviHide) != '1' ] ">
 
    <xsl:sort select="@createDate" order="descending" />
 <xsl:if test="position() &lt;= $numberOfPosts"> <li>
    <a href="{umbraco.library:NiceUrl(@id)}">
      <xsl:value-of select="blogHeader"/>
   </a>
   <br />
   <div id="date">
- <xsl:value-of select="umbraco.library:FormatDateTime(@createDate, 'MMMM d, yyyy')"/>
   </div>
  </li>
  </xsl:if>
</xsl:for-each>

</ul>

</xsl:template>