Jak połączyć się z serwisem WCF?

    [OperationContract]
    [XmlSerializerFormat]
    [FaultContract(typeof (StandardFault))]
    [WebGet(UriTemplate = "Doors?sdKey={sdKey}")]
    List<LightComponent<Door>> GetDoors(string sdKey);

<ArrayOfLightComponentOfDoor xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <LightComponentOfDoor>
        <Session>OperatorSession</Session>
        <ID>424</ID>
        <Description>Controller #1 Door #1 (01.01)</Description>
        <Object>12</Object>
        <Owner>423</Owner>
        <item>
            <key>
                <string>DESCRIPTION2</string>
            </key>
            <value>
                <SmartLinkDataValue>
                    <Value>Controller #1 Door #1</Value>
                </SmartLinkDataValue>
            </value>
        </item>
        <item>
            <key>
                <string>ELEVATORCAB</string>
            </key>
            <value>
                <SmartLinkDataValue>
                    <Value>0</Value>
                </SmartLinkDataValue>
            </value>
        </item>
    </LightComponentOfDoor>
</ArrayOfLightComponentOfDoor>

        static void Main(string[] args)
        {
            var myBinding = new WebHttpBinding();
            var myEndpoint = new EndpointAddress("http://localhost/SmartService");
            var factory = new ChannelFactory<ISmartService>(myBinding, myEndpoint);
            factory.Endpoint.Behaviors.Add(new WebHttpBehavior());

            ISmartService client = null;

            client = factory.CreateChannel();
            client.Login(username, password);
.....

System.InvalidOperationException: Dokument XML zawiera błąd (1, 12797). ---> System.ArgumentException: Nie można odnaleźć metody set właściwości.
   w System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
   w System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
   w Kantech.SmartLinkSDK.DataComponent.CreateFromXML(XElement xmlElement, Object ObjectToBuild)
   w Kantech.SmartLinkSDK.DataComponent.ReadXml(XmlReader reader)
   w System.Xml.Serialization.XmlSerializationReader.ReadSerializable(IXmlSerializable serializable, Boolean wrappedAny)
   w Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReader1.Read115_Operator()
   w Microsoft.Xml.Serialization.GeneratedAssembly.OperatorSerializer.Deserialize(XmlSerializationReader reader)
   w System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)