"Exception of type Microsoft.SharePoint.SoapServer.SoapServerException was thrown." when calling UpdateList

Dim w2 As New WSS2.Lists
            w2.Credentials = System.Net.CredentialCache.DefaultCredentials
            w2.Url = "http://fcssharepoint.dg.dgcouncil.net/TS/PM/ti/_vti_bin/Lists.asmx"
 
            Dim destinationListName As String
 
            destinationListName = "{576830B0-B9EA-4B7C-AA72-96D86E6E66ED}"
 
            Dim ndList As XmlNode = w2.GetList(destinationListName)
            Dim ndVersion As XmlNode = ndList.Attributes("Version")
 
            Dim xmlDoc As New System.Xml.XmlDocument()
            Dim ndProperties As XmlNode = xmlDoc.CreateNode(XmlNodeType.Element, "List", "")
            Dim ndTitleAttrib As XmlAttribute = CType(xmlDoc.CreateNode(XmlNodeType.Attribute, "Title", ""), XmlAttribute)
            Dim ndDescriptionAttrib As XmlAttribute = CType(xmlDoc.CreateNode(XmlNodeType.Attribute, "Description", ""), _
                XmlAttribute)
 
            ndTitleAttrib.Value = ndList.Attributes("Title").Value
            ndDescriptionAttrib.Value = ndList.Attributes("Description").Value
 
            ndProperties.Attributes.Append(ndTitleAttrib)
            ndProperties.Attributes.Append(ndDescriptionAttrib)
 
            Dim ndDeleteFields As XmlNode = xmlDoc.CreateNode(XmlNodeType.Element, "Fields", "")
            Dim ndUpdateFields As XmlNode = xmlDoc.CreateNode(XmlNodeType.Element, "Fields", "")
            Dim ndNewFields As XmlNode = xmlDoc.CreateNode(XmlNodeType.Element, "Fields", "")
 
            ndNewFields.InnerXml = "<Method ID=""1""><Field Type=""Boolean"" DisplayName= ""RFC""/></Method><Method ID=""1""><Field Type=""Boolean"" DisplayName= ""Post Project Task""/></Method>"
 
            
            Dim responseNode As XmlNode = w2.UpdateList(destinationListName, _
                                                        ndProperties, _
                                                        ndNewFields, _
                                                        ndUpdateFields, _
                                                        ndDeleteFields, _
                                                        ndVersion.Value)

                                  

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