xComponet示例代码不能使用

@Entry 
@Component 
struct Index { 
  xComponentContext: object | undefined = undefined; 
 
  build() { 
    Column() { 
      Row() { 
        XComponent({ id: ‘xcomponentId’, type: ‘surface’, libraryname: ‘entry’ }) 
          .onLoad((xComponentContext) => { 
            this.xComponentContext = xComponentContext 
          }).width(‘640px’) // 64的倍数 
      }.height(‘88%’) 
    } 
  } 
}