Getting an error when transforming xml though xsl

Here is the code I am using:
		StringWriter xmlStream = null;
		XmlTextWriter xmlWriter = null;
 
		//Create/setup the xml stream and writer
		xmlStream = new System.IO.StringWriter();
		xmlWriter = new XmlTextWriter(xmlStream);
		xmlWriter.Formatting = System.Xml.Formatting.None;
 
		xmlWriter.WriteStartElement("DOCUMENT_EMAIL_IN");
 
		string toName = string.Empty;
		if (history.ToRecipients.Length > 0)
		{
			for (int i = 0; i < history.ToRecipients.Length; i++)
			{
				if (i == 0)
				{
 
					toName = history.ToRecipients[i].Name;
				}
				else
				{
					toName = toName + ";" + history.ToRecipients[i].Name;
				}
			}
		}
		xmlWriter.WriteElementString("EMAIL_TO_NAME", toName);
		xmlWriter.WriteElementString("EMAIL_FROM_NAME", Convert.ToString(history.From.Name));
 
		string ccName = string.Empty;
		if (history.CCRecipients.Length > 0)
		{
			for (int i = 0; i < history.CCRecipients.Length; i++)
			{
				if (i == 0)
				{
					ccName = history.CCRecipients[i].Name;
				}
				else
				{
					ccName = ccName + ";" + history.CCRecipients[i].Name;
				}
			}
		}
		xmlWriter.WriteElementString("EMAIL_CC_NAME", ccName);
 
		xmlWriter.WriteElementString("EMAIL_SUBJECT", Convert.ToString(history.Subject));
		xmlWriter.WriteElementString("EMAIL_DATE_RECEIVED", Convert.ToString(history.DateSent));
		xmlWriter.WriteElementString("EMAIL_BODY", Convert.ToString(history.Text));
 
		xmlWriter.WriteEndElement();    //DOCUMENT_EMAIL_IN
 
		string sAppPath = AppDomain.CurrentDomain.BaseDirectory.ToString();
		XmlDocument xmlDoc = new XmlDocument();
		xmlDoc.LoadXml(xmlStream.ToString());
 
		// create an XPathNavigator to use for the transform
		XmlElement root = xmlDoc.DocumentElement;
		XPathNavigator nav = root.CreateNavigator();
 
		// Transform the file
		XslCompiledTransform xsl = new XslCompiledTransform();
		xsl.Load(sAppPath + @"Transform\\EmailView-Transform.xsl");
		StringWriter writer = new StringWriter();
		xsl.Transform(nav, null, XmlWriter.Create(writer));    
 
		Response.Write(writer.ToString());
		Response.End();

                                  

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