Incompatible types. Found: 'com.example.myapplication.MainMenu_test', required: 'androidx.fragment.app.Fragment'

Question

I'm trying to integrate my project with MapBox.

Here is it:

@Override
        public void onResponse(Call<User> call, Response<User> response) {
            if(response.isSuccessful()){


                if (response.body() != null) {

                    String token = response.body().getToken();


                    SharedPreferences preferences = getActivity().getSharedPreferences("myPrefs", Context.MODE_PRIVATE);
                    SharedPreferences.Editor prefLoginEdit = preferences.edit();
                    prefLoginEdit.putBoolean("loggedin", true);
                    prefLoginEdit.putString("token", token);
                    prefLoginEdit.commit();



                    Toast.makeText(getContext(), token, Toast.LENGTH_SHORT).show();

                    Fragment fragment = null;
                    fragment = new MainMenu_test();
                    replaceFragment(fragment);

                }

            }else {
                Toast.makeText(getContext(), "wrong login or password :(", Toast.LENGTH_SHORT).show();
            }

When i'm trying to put in fragment = new MainMenu_test i'm getting error

Incompatible types. Found: 'com.example.myapplication.MainMenu_test', required: 'androidx.fragment.app.Fragment'

When i put instead of MainMenu_test (Empty Activity), MainMenu (Java class which i created) everything is okay.

How I can fix this error ?