Cannot add a nested relation or an element column to a table containing a SimpleContent column

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ASP.NET

XML

I don't understand why this error is happening when I try to load my xml
into my DataSet.

"Cannot add a nested relation or an element column to a table containing a
SimpleContent column."

XmlTextReader read = new XmlTextReader("http://msdn.microsoft.com/rss.xml");
        DataSet ds = new DataSet();
        ds.ReadXml(read);
        ListView1.DataSource = ds.Tables[4];
        ListView1.DataBind(); "