[Mono-list] Error while run program

[Arx Henrique]

Hi all,

Sorry my english one more time
I'm have problems with mono when i try run a example that i see in one
book, they compile correct but when i run show this error:

Unhandled Exception: System.NullReferenceException: Object reference not
set to an instance of an object
in <0x000bc> DotNetXmlSample.XmlSample:Main (string[])

i dont know what is this
somebody can help me ?

i use debian unstable with mono 1.0


this is the code:

using System;
using System.Xml;

namespace DotNetXmlSample
{
        public class XmlSample
        {
                static void Main(string[] args)
                {
                        XmlDocument SampleDoc = new XmlDocument();
                        XmlNode RootNode = null;
                        XmlNode RegionNode = null;
                        XmlNode RegionDescription = null;
                        SampleDoc.Load("/home/ahcruz/teste.xml");
                        RootNode = SampleDoc.DocumentElement;
                        RegionNode = RootNode.ChildNodes[0];
                        RegionDescription = RootNode.SelectSingleNode("description");
                        RegionDescription.InnerText = "Reeeeeealy fast";
                        SampleDoc.Save("/home/ahcruz/teste_2.xml");
                }
        }
}

And this is the xml file

<?xml version="1.0"?>
<links>
  <category xmlns="prog">
    <address>one addres</address>
    <description>one description</description>
  </category>
  <category xmlns="prog2">
    <address>two addres</address>
    <description>two description</description>
  </category>
</links>

thanks a lot of

Arx Henrique

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