problem decoding xml file to object

hi.

i'm having this log affter loading correctly the xml file.

after try work around the problem i get no solution for it.

 A first chance exception of type 'System.ArgumentException' occurred in System.Xml.Linq.ni.dll
 An exception of type 'System.ArgumentException' occurred in System.Xml.Linq.ni.dll but was not handled in user code
 Exception: Non white space characters cannot be added to content.
 Type: System.ArgumentException
 Module: System.Xml.Linq
 InnerException: <No Data>
 AdditionalInfo:<No Data>
    at System.Xml.Linq.XDocument.ValidateString(String s)
    at System.Xml.Linq.XContainer.AddStringSkipNotify(String s)
    at System.Xml.Linq.XContainer.AddContentSkipNotify(Object content)
    at System.Xml.Linq.XContainer.AddContentSkipNotify(Object content)
    at System.Xml.Linq.XDocument..ctor(Object[] content)
    at SerializeXml.DeserializeObject[T](String pXmlizedString)
    at CrossPromotionButtons.Start()
    at CrossPromotionButtons.UnityFastInvoke_Start()

i'm working in unity 4.3.1, and compile to wp8.

the code goes down in here

public static T DeserializeObject(String pXmlizedString) {

      string xmlString = pXmlizedString;
 
      XmlSerializer xs = new XmlSerializer(typeof(T));
      MemoryStream memoryStream = new MemoryStream(StringToUTF8ByteArray(xmlString));
      XDocument xmlText = new XDocument(memoryStream,Encoding.UTF8);
      
      return (T)xs.Deserialize(memoryStream);
 
  }

appreciate some help please thank's