HarmonyOS 找不到对应组件

@Entry  
@Component  
struct FlowLayOut {  
  @State simpleList: Array<string> = ['hkjh', 'jfgutiuyi', 'ujghgii', 'jgihochosgiowio',  
    'vjuhgjghihiohoihuyoiupoujo', 'dd', 'ytyu','uuioyfoooiuouou','iuyy89','uiyye9w37e92379er2739er',  
  'gu','jhhjkjgkgkghh','hgfjsgf','judsgfiusdyhfosiydhfoasiufoidsi']  
  build() {  
    Column() {  
      Column({ space: 5 }) {  
        Text('流式布局').fontSize(20).fontColor(0xCCCCCC).width('90%')  
        // 子组件多行布局  
        Flex({ wrap: FlexWrap.Wrap }) {  
          ForEach(this.simpleList, (item: string) => {  
            ChildItem({ item: item })  
          }, (item: string) => item)  
        }  
        .width('90%')  
        .padding(5)  
        .backgroundColor(Color.Green)  
  
      }.width('100%').margin({ top: 5 })  
    }.width('100%')  
  }  
}  
@Component  
struct ChildItem {  
  @Prop item: string;  
  build() {  
    Text(this.item).margin({left:5,right:5,bottom:5})  
      .backgroundColor(Color.Pink)  
  }  
}