Tidak dapat membuat instance ViewModel di android

Halo, saya baru mengenal android dan telah mencoba mempelajari MVVM tetapi saya tidak dapat mengetahui mengapa saya salah mengatakan tidak dapat membuat instance kelas viewmodel:

Ini adalah kesalahan yang saya dapatkan:

2020-06-29 12:30:26.293 15174-15174/com.carrot.roomdatabase E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.carrot.roomdatabase, PID: 15174
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.carrot.roomdatabase/com.carrot.roomdatabase.MainActivity}: java.lang.RuntimeException: Cannot create an instance of class com.carrot.roomdatabase.ViewModel
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3388)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3527)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2123) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7710) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
     Caused by: java.lang.RuntimeException: Cannot create an instance of class com.carrot.roomdatabase.ViewModel
        at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.java:221) at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:187) at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:150) at com.carrot.roomdatabase.MainActivity.onCreate(MainActivity.java:31) at android.app.Activity.performCreate(Activity.java:7820) at android.app.Activity.performCreate(Activity.java:7809) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1318) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3363) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3527)  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2123) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7710) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)  Caused by: java.lang.InstantiationException: java.lang.Class<com.carrot.roomdatabase.ViewModel> has no zero argument constructor at java.lang.Class.newInstance(Native Method) at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.java:219)
        at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:187) 
        at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.java:150) 
        at com.carrot.roomdatabase.MainActivity.onCreate(MainActivity.java:31) 
        at android.app.Activity.performCreate(Activity.java:7820) 
        at android.app.Activity.performCreate(Activity.java:7809) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1318) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3363) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3527) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2123)  at android.os.Handler.dispatchMessage(Handler.java:107)  at android.os.Looper.loop(Looper.java:214)  at android.app.ActivityThread.main(ActivityThread.java:7710)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950) 
2020-06-29 12:30:26.304 15174-15174/? I/Process: Sending signal. PID: 15174 SIG: 9

Di bawah ini adalah kelasku

Kelas MainActivity.java:

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private recycleViewAdapter adapter;
    private ViewModel viewModel;
    private List<NotesEntity> notesEntityList = new ArrayList<>();
    private FloatingActionButton btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewModel = new ViewModelProvider(this).get(ViewModel.class);
        viewModel.getAllNotes().observe(this, new Observer<List<NotesEntity>>() {
            @Override
            public void onChanged(List<NotesEntity> notesEntities) {
                Toast.makeText(MainActivity.this, "onChanged", Toast.LENGTH_SHORT).show();
                adapter.notifyDataSetChanged();
            }
        });

        btn = findViewById(R.id.floatingActionButton);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this , AddNote.class));
            }
        });
        init();
    }
    private void init(){
        adapter = new recycleViewAdapter(notesEntityList);
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
    }
}

Kelas ViewModel.java:

public class ViewModel extends AndroidViewModel {
    private Repository repository;
    private LiveData<List<NotesEntity>> allNotes;
    public ViewModel(@NonNull Application application) {
        super(application);
        repository = new Repository(application);
        allNotes = repository.getNotes();
    }

    public void insertThis(NotesEntity notesEntity){
        repository.Insert(notesEntity);
    }
    public void deleteThis(NotesEntity notesEntity){
        repository.Delete(notesEntity);
    }

    public LiveData<List<NotesEntity>> getAllNotes(){
        return allNotes;
    }
}

dapatkah seseorang membantu saya dalam mencari tahu apa yang saya lakukan salah. Terima kasih.

Inisialisasi ViewModel seperti ini. Anda juga harus meneruskan ViewModelFactory dengan konstruktor ViewModelProvider.

viewModel = new ViewModelProvider(this, new ViewModelProvider.AndroidViewModelFactory(getApplication())).get(ViewModel.class);

Semoga ini membantu.......