This operation would create an incorrectly structured document. XDocument

I'm trying to create an XML, but I can not. I want it to have this format:

<item>
      <linktext></linktext>
      <etc..></etc...>
</item>

I can add an item, but when I go through the loop again, it goes out of try and gives me the title error. What am I doing wrong? Here's how I create XML:

XDocument xmlOut = new XDocument();
 XElement item = new XElement("item",
                        new XElement("linktext", processedXML),
                        new XElement("link", "http://www.boe.es/diario_boe/txt.php?id=" + tmpName[1]),
                        new XElement("guid", newPdf.ToString()),
                        new XElement("pubDate", DateTime.Now)
                        );

                    xmlOut.Add(item);