HarmonyOS鸿蒙Next PC中创建悬浮窗成功，但是显示失败报错Failed to show the window. Cause: {"code":1300002}

HarmonyOS鸿蒙Next PC中创建悬浮窗成功，但是显示失败报错Failed to show the window. Cause: {“code”:1300002} 安装官方的代码，创建悬浮窗是成功的，也加载页面了，但是调用showWindow方法报错了

Failed to show the window. Cause: {“code”:1300002}

代码就是官方的代码，一模一样

let windowClass: window.Window|null = null;
// 窗口类型设置为window.WindowType.TYPE_FLOAT
let config: window.Configuration = {
  name: "floatWindow", windowType: window.WindowType.TYPE_FLOAT, ctx: getContext(this)
};
// 创建悬浮窗
window.createWindow(config, (err, data) => {
  if (err.code) {
    console.error('Failed to create the floatWindow. Cause: ' + JSON.stringify(err));
    return;
  }
  console.info('Succeeded in creating the floatWindow. Data: ' + JSON.stringify(data));
  windowClass = data;
  // 用windowClass变量接收创建的悬浮窗
  this.windowClass = data;
  // 设置悬浮窗位置
  windowClass.moveWindowTo(300, 300, (err) => {
    if (err.code) {
      console.error('Failed to move the window. Cause:' + JSON.stringify(err));
      return;
    }
    console.info('Succeeded in moving the window.');
  });
  // 设置悬浮窗大小
  windowClass.resize(500, 500, (err) => {
    if (err.code) {
      console.error('Failed to change the window size. Cause:' + JSON.stringify(err));
      return;
    }
    console.info('Succeeded in changing the window size.');
  });
  // 为悬浮窗加载页面内容，这里可以设置在main_pages.json中配置的页面
  windowClass.setUIContent("pages/FloatContent", (err) => {
    if (err.code) {
      console.error('Failed to load the content. Cause:' + JSON.stringify(err));
      return;
    }
    console.info('Succeeded in loading the content.');
    // 显示悬浮窗。
    if (windowClass != null){
      windowClass.showWindow((err) => {
        if (err.code) {
          console.error('Failed to show the window. Cause: ' + JSON.stringify(err));
          return;
        }
        console.info('Succeeded in showing the window.');
      });
    }
  });
});