static startGeofenceService(
      {required String? pointedLatitude,
        required String? pointedLongitude,
        required String? radiusMeter,
        int? eventPeriodInSeconds}) {
    //parsing the values to double if in any case they are coming in int etc
    double latitude = _parser(pointedLatitude);
    double longitude = _parser(pointedLongitude);
    double radiusInMeter = _parser(radiusMeter);
    //starting the geofence service only if the positionstream is null with us
    if (_positionStream == null) {
      _geoFencestream = _controller.stream;
      _positionStream = Geolocator.getPositionStream(
        desiredAccuracy //here the error: LocationAccuracy.high,
      ).listen((Position position) {
        double distanceInMeters = Geolocator.distanceBetween(
            latitude, longitude, position.latitude, position.longitude);
        _printOnConsole(
            latitude, longitude, position, distanceInMeters, radiusInMeter);
        _checkGeofence(distanceInMeters, radiusInMeter);
        _positionStream!
            .pause(Future.delayed(Duration(seconds: eventPeriodInSeconds!)));
      });
      _controller.add(GeofenceStatus.init);
    }
  }

我不知道为什么“desiredAccuracy”部分会出错。我认为代码是正确的，对吗？请给我发送帮助如何解决这个问题