The parameter transfer of the new version of sendPort. send is restricted

[knight0zh]

The parameter transfer of the new version of sendPort. send is restricted, and I am unable to implement the step counting function. Please tell me what to do?

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  ...
  @override
  void onRepeatEvent(DateTime timestamp, SendPort? sendPort) async {
    final pedometer = Pedometer.stepCountStream;
    final StepCount event = await pedometer.first;
    FlutterForegroundTask.updateService(
        notificationTitle: 'Current steps', notificationText: '${event.steps}');
    sendPort?.send(event);
  }
  ...

Error

E/flutter (14899): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Invalid argument: is a regular instance reachable via : Instance of 'StepCount'