android - Kotlin이 작동하지 않는 EventBus가 작동하지 않습니다

Android를 처음 사용하고 EventBus를 사용하여 Fragment에서 컨테이너 활동으로 메시지를 보내려고합니다. 그러나 오류가 발생했습니다 :

D/EventBus: No subscribers registered for event class com.app.todo.controllers.task.TaskListFragment$TaskCreateSelectEvent

다음은 EventBus와 관련된 Activity 클래스의 코드입니다.

public class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
    @Subscribe(threadMode = ThreadMode.MAIN)
    fun onTaskCreateSelectEvent(event: TaskListFragment.TaskCreateSelectEvent) {
        Log.d("TAG", "On Main Activity")
    }
    fun addFragment(fragment: Fragment) {
        val transaction = supportFragmentManager.beginTransaction()
        transaction.setCustomAnimations(R.anim.enter, R.anim.exit, R.anim.pop_enter, R.anim.pop_exit)
        transaction.add(R.id.task_fragment_container, fragment)
        transaction.addToBackStack(fragment.javaClass.simpleName)
        transaction.commit()
    }
    public override fun onStart() {
        super.onStart()
        EventBus.getDefault().register(this)
    }
    public override fun onStop() {
        super.onStop()
        EventBus.getDefault().unregister(this)
    }
}

다음은 프래그먼트 클래스에 있습니다

public class TaskListFragment : Fragment() {
    private var fab: FloatingActionButton? = null
    public class TaskCreateSelectEvent {
        var fab: FloatingActionButton? = null
    }
    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        var view = inflater!!.inflate(R.layout.task_list_fragment, container, false)
        fab = view.findViewById<FloatingActionButton>(R.id.fab)
        fab!!.setOnClickListener {
            val selectEvent = TaskCreateSelectEvent()
            EventBus.getDefault().post(selectEvent)
        }
        return view
    }
}

build.gradle

내가 뭘 잘못하고 있는지 아는가?