WCF+winfrom的开发有个问题请教!

[cyshiwo01]

刚接触WCF写了个方法带个Object参数如下：
[OperationContract(IsOneWay = true)]
void Start(object obj);
然后winfrom引用WCF的地址调用,下面就报错了。请问要怎么处理呢。
ServiceClient client = new ServiceClient();
Thread thread = new Thread(new ParameterizedThreadStart(client.Start));
thread.Start(Data);