PC端开发，选择会话接口 出现 API NOT EXIST 问题

PC端应用可开发时，调用”选择会话“接口，页面无响应。在onFail中加入错误提示弹窗，提示 “错误编号404,错误原因API NOT EXIST ” ，是这个 biz.chat.chooseConversation API还没开放么？

DingTalkPC.biz.chat.chooseConversation({
                onSuccess: function(data) {
                     /* data结构
                      {
                        "id":"25001:2442003", //会话id
                        "title":"钉钉-轻浅-pc专业户" // 会话名称
                      }
                    */
                },
                onFail : function(err) {
                    DingTalkPC.device.notification.alert({
                        message: err.reason,
                        title: err.code, //可传空
                        buttonName: "收到",
                        onSuccess : function() {
                             /*回调*/
                        },
                        onFail : function(err) {}
                    });
                }
            });