WEBAPI抛“方法未实现异常”

// 使用webapi引用组件Kingdee.BOS.WebApi.Client.dll
ApiClient client = new ApiClient(" aaaaaaaaaaaaaaaaaaaaaaa ");
object[] loginInfo = new object [] {
"54793ddfdccacb",//帐套Id
"Administrator",//用户名
"888888",//密码
2052}//语言id
var ret = client.Execute("Kingdee.BOS.WebApi.ServicesStub.AuthService.ValidateUser",loginInfo);
var result = JObject.Parse(ret)["LoginResultType"].Value();
// 登陆成功
if (result == 1)
{
client.Execute("Kingdee.BOS.WebApi.ServicesStub.DynamicFormService.View",new object [] {"STK_InStock","{\"CreateOrgId\":0,\"Number\":\"String\",\"Id\":\"String\"}"};
}