Kotlin ViewHolder类提供了房间数据库错误

我正在尝试将房间数据库添加到我之前制作的测验应用程序中。 我得到这个错误：

/Users/olofhammar/AndroidStudioProjects/QuizApp1/app/build/tmp/kapt3/stubs/debug/com/example/quizapp1/SetNrOfQuestionsFragment.java:7: error: cannot find symbol
    private FragmentCommunicator fragmentCommunicator;
            ^
  symbol:   class FragmentCommunicator
  location: class SetNrOfQuestionsFragment[WARN] Incremental annotation processing requested, but support is disabled because the following processors are not incremental: androidx.room.RoomProcessor (DYNAMIC)

它还说“生成”文件夹下的文件已生成，不应编辑” 导致崩溃的实现是：

kapt "androidx.room:room-compiler:$room_version"

我使用viewmodel类在片段之间进行通信。那个班看起来像这样

class FragmentCommunicator : ViewModel(){

    val nrOfQuestions = MutableLiveData<Any>()

    fun sendNrOfQuestions(nr:Int){
        nrOfQuestions.setValue(nr)
    }
}

 private var fragmentCommunicator: FragmentCommunicator? = null
    private var totalNrOfQuestions = 0
    private var soundPool = SoundPool()

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val view: View = inflater.inflate(R.layout.fragment_set_nr_of_questions, container, false)

        fragmentCommunicator= ViewModelProviders.of(activity!!).get(FragmentCommunicator::class.java)

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感谢您的建议。

您是指ViewModel而不是ViewHolder吗？另外，请提供部分实际房间代码。