HarmonyOS 鸿蒙Next 仓颉开发报错 error: undeclared identifier 'ViewStackProcessor'

HarmonyOS 鸿蒙Next 仓颉开发报错 error: undeclared identifier ‘ViewStackProcessor’ 仓颉开发HarmonyOS，报这个错：

error: undeclared identifier 'ViewStackProcessor'
| 
| /* 42.24 */        ViewStackProcessor.StartGetAccessRecordingFor(ViewStackProcessor.AllocateNewElmetIdForNextComponent())
|                    ^^^^^^^^^^^^^^^^^^ 
| 
note: the error occurs after the macro is expanded
==> D:\workspace\gitee\develop-native-harmonyos-ai-assistant-with-cangjie-video\samples\ch5\CangjieAiAssistant\entry\src\main\cangjie\src\page\intelligent_chat_page.cj:42:1:
|
42  |   @Entry
|  _
43  | | @Component
| | ...
125 | | }
| |_^
|

已知，是在代码里面用了if/else引起的，有谁知道问题在哪？

func build() {
    if (isSelf) {
        Row() {
            Row() {
                Text(content)
            }.padding(10).backgroundColor(0xffffff).borderRadius(10).constraintSize(maxWidth: 90.percent).margin(
                right: 10)
        }.justifyContent(FlexAlign.End).width(100.percent).padding(left: 10).margin(top: 10, bottom: 10)
    } else {
        Row() {
            Row() {
                Text(content)
            }.padding(10).backgroundColor(0xffffff).constraintSize(maxWidth: 90.percent).borderRadius(10).margin(
                left: 10)
        }.width(100.percent).padding(right: 10).margin(top: 10, bottom: 10, right: 10)
    }
}