the error document in{1,2} in xml throwing excetion

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XML

internal MakeModelListDTO DeserilizeXML(string xmlString, ref string returnStatus)
{
MakeModelListDTO resp = null;
string xmlString1 = @"
<env:envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns0="http://iims.services/types/">
<env:body>
<ns0:savequote_genericresponseelement xsi:type="ns0:ProposalDTO"><ns0:usercode xsi:nil="1">
<ns0:rolecode xsi:nil="1"><ns0:pretcode>100<ns0:userid xsi:nil="1">
<ns0:stakecode xsi:nil="1"><ns0:roleid xsi:nil="1"><ns0:userroleid xsi:nil="1">
<ns0:branchcode xsi:nil="1">
<ns0:preterr>Custom Error -> ORA-01403: no data found
<ns0:polbranchcode xsi:nil="1"><ns0:productname xsi:nil="1">
<ns0:policyholdercode xsi:nil="1"><ns0:eventdate>16/10/2013 16:10:15
<ns0:netpremium>765.00<ns0:termunit xsi:nil="1">
<ns0:grosspremium>680.00<ns0:policytype xsi:nil="1">
<ns0:polinceptiondate xsi:nil="1"><ns0:branchcode xsi:nil="1">
<ns0:term xsi:nil="1"><ns0:poleventeffectiveenddate xsi:nil="1">
<ns0:polstartdate xsi:nil="1"><ns0:productcode xsi:nil="1">
<ns0:policyholdername xsi:nil="1"><ns0:productid xsi:nil="1">
<ns0:servicetax>85.00<ns0:status xsi:nil="1">
<ns0:suminsured xsi:nil="1"><ns0:updatedate xsi:nil="1">
<ns0:polexpirydate xsi:nil="1"><ns0:policyid>18524965016102013
<ns0:poldetaillastupdatedate>16/10/2013 16:10:26
<ns0:quoteno>1302001310033770<ns0:policyno xsi:nil="1">
<ns0:policydetailid>18524965116102013<ns0:documentlink xsi:nil="1">
<ns0:pollastupdatedate>16/10/2013 16:10:15";
// try
// {

// XmlTextReader textReader = new XmlTextReader("C:\\XML_NIA.XML");

// List<nia> movieList = new List<nia>();

// while (textReader.Read())
// {
// NIA movie = new NIA();

// if (textReader.MoveToContent() == XmlNodeType.Element && textReader.Name == "ns0:grossPremium")
// movie.grossPremium = textReader.ReadElementString();
// if (textReader.MoveToContent() == XmlNodeType.Element && textReader.Name == "ns0:netPremium")
// movie.netPremium = textReader.ReadElementString();

// if (!String.IsNullOrEmpty(movie.grossPremium))
// movieList.Add(movie);
// }
// }

try
{
var xRoot = new System.Xml.Serialization.XmlRootAttribute();
xRoot.ElementName = "env:Envelope";
xRoot.IsNullable = true;
xRoot.Namespace = "http://schemas.xmlsoap.org/soap/envelope/";
XmlSerializer serializer = new XmlSerializer(typeof(saveQuote_GenericResponseElement), xRoot);

using (var stream = new MemoryStream(Encoding.ASCII.GetBytes(xmlString1)))
{
var doc = new System.Xml.XmlDocument();
doc.Load(stream);

var nsManager = new System.Xml.XmlNamespaceManager(doc.NameTable);
nsManager.AddNamespace("env", "http://schemas.xmlsoap.org/soap/envelope/");

//so I can get the actual response and not the soap body
var node = doc.SelectSingleNode("//env:Body", nsManager);

if (node != null)
{
byte[] xml = Encoding.UTF8.GetBytes(node.LastChild.InnerXml);
using (var memStream = new System.IO.MemoryStream(xml))
{
memStream.Position = 0;
saveQuote_GenericResponseElement Envelop = (saveQuote_GenericResponseElement)serializer.Deserialize(memStream); //Throws exception here
}
}
}
}

catch (Exception ex)
{
returnStatus = "Failure";
}
return resp;
}