print

System.ArgumentException: Item has already been added. Key in dictionary: "http://www.sitecore.net/dot" Key being added: "http://www.sitecore.net/dot"
at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)
at System.Collections.Hashtable.Add(Object key, Object value)
at System.Xml.Xsl.XsltArgumentList.AddExtensionObject(String namespaceUri, Object extension)
at Sitecore.WebControls.XslFile.AddExtensionObject(XsltArgumentList list, XslExtensionInfo info)
at Sitecore.WebControls.XslFile.AddExtensionObjects(XsltArgumentList list, IWebItem itm)
at Sitecore.WebControls.XslFile.DoRender(HtmlTextWriter output)

Xsl file could not be processed: /xsl/Xsl document.xslt