Error occurred while executing stylesheet 'project/list.xsl'.

System.Xml.Xsl.XsltException: '' cannot be a child of '' element.

   at System.Xml.Xsl.NewInstructionAction.Execute(Processor processor, ActionFrame frame)

   at System.Xml.Xsl.ActionFrame.Execute(Processor processor)

   at System.Xml.Xsl.Processor.Execute()

   at System.Xml.Xsl.XslTransform.Transform(IXPathNavigable input, XsltArgumentList args, XmlWriter output)

   at NXslt.NXslt.Process()

<?xml version="1.0"?>
<a/>

<?xml version="1.0"?>
<xsl:stylesheet
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:exsl="http://exslt.org/common"
    extension-element-prefixes="exsl">

<xsl:import href="aa.xsl"/>

</xsl:stylesheet>

<?xml version="1.0"?>
<xsl:stylesheet
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:exsl="http://exslt.org/common"
    extension-element-prefixes="exsl">

<xsl:template match="*">
    <exsl:document href="b.xml"><b/></exsl:document>
</xsl:template>

</xsl:stylesheet>

Error occurred while executing stylesheet 'a.xsl'.

System.Xml.Xsl.XsltException: '' cannot be a child of '' element.
...