HarmonyOS 长时任务启动失败9800005

启动长时任务连接ble蓝牙，任务启动失败失败错误码：{“code”:9800005,“message”:“BussinessError 9800005: Continuous Task verification failed. The bgMode is invalid.”}

代码如下：

let wantAgentInfo: wantAgent.WantAgentInfo = {
  // 点击通知后，将要执行的动作列表，需要被拉起的应用的bundleName和abilityName
  wants: [
    {
      bundleName: 'com.huawei.ivcs.demo',
      abilityName: 'ApplicationAbility',
    }
  ],
  // 点击通知栏执行的动作类型，拉起页面
  actionType: wantAgent.OperationType.START_ABILITY,
  requestCode: 1111,
  // 点击通知后，动作的属性
  actionFlags: [
    wantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG,
  ],
};
wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj: WantAgent) => {
  backgroundTaskManager.startBackgroundRunning(getContext(this),
    backgroundTaskManager.BackgroundMode.BLUETOOTH_INTERACTION, wantAgentObj).then(() => {
    digitalKeyLog.log('BLEConnectPage', 'startBackgroundRunning success');
    // 发起ble连接
    this.clickStartConnect();
  }).catch((err: BusinessError) => {
    digitalKeyLog.error('BLEConnectPage', 'startBackgroundRunning error:' + JSON.stringify(err));
  });
}).catch((err: BusinessError) => {
  digitalKeyLog.error('BLEConnectPage', 'getWantAgent error:' + JSON.stringify(err));
});