realmの立ち上げでclass has been addedのエラー

android studioでrealmを使ったプログラムを書いています。

　アプリ起動時に、settignという名前のテーブルに何も書き込まれていなければ、初期値で埋めるプログラムを書こうと思っています。

最初のrealmの宣言部分でエラーになってしまいます。

Caused by: io.realm.exceptions.RealmMigrationNeededException: Migration is required due to the following errors:

Class 'Setting' has been added.

なお、こういった処理をmainActivityのクラスの中でやるべきものかも、よく分からないので、もっといいやり方をご存知の方がいらっしゃったらついでにアドバイスをいただけると助かります。

java
1package com.example.steps_test3;
2
3import android.os.Bundle;
4
5import com.google.android.material.bottomnavigation.BottomNavigationView;
6
7import androidx.appcompat.app.AppCompatActivity;
8import androidx.navigation.NavController;
9import androidx.navigation.Navigation;
10import androidx.navigation.ui.AppBarConfiguration;
11import androidx.navigation.ui.NavigationUI;
12import io.realm.Realm;
13import io.realm.RealmConfiguration;
14import io.realm.RealmQuery;
15
16import com.example.steps_test3.databinding.ActivityMainBinding;
17import com.example.steps_test3.Setting;
18
19
20import java.util.concurrent.atomic.AtomicReference;
21
22public class MainActivity extends AppCompatActivity {
23
24    private ActivityMainBinding binding;
25
26    @Override
27    protected void onCreate(Bundle savedInstanceState) {
28        super.onCreate(savedInstanceState);
29
30        binding = ActivityMainBinding.inflate(getLayoutInflater());
31        setContentView(binding.getRoot());
32
33        BottomNavigationView navView = findViewById(R.id.nav_view);
34
35        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
36                R.id.navigation_home, R.id.navigation_setting, R.id.navigation_user)
37                .build();
38        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_activity_main);
39        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
40        NavigationUI.setupWithNavController(binding.navView, navController);
41
42        Realm.init(this);
43
44        RealmConfiguration config = new RealmConfiguration.Builder()
45                .allowQueriesOnUiThread(true)
46                .allowWritesOnUiThread(true)
47                .build();
48        Realm realm = Realm.getInstance(config);  ←エラー箇所
49        RealmQuery<Setting> settingQuery = realm.where(Setting.class);
50        long numSetting =
51                settingQuery.count();
52        if (numSetting == 0) {
53            // create an reference to a frog
54            AtomicReference<Setting> setting = new AtomicReference<Setting>();
55            for(int i = 0; i < 5; i++){
56                // insert a new frog into the database and store it in our reference
57                int finalI = i;
58                realm.executeTransaction(transactionRealm -> {
59                    Setting result = transactionRealm.createObject(Setting.class);
60                    result.setSetting_id(finalI);
61                    result.setAwait(2);
62                    result.setInterval(3);
63                    setting.set(result);
64                });
65            }
66        }
67
68    }
69
70}

logcat
12021-07-18 16:09:04.015 28013-28013/com.example.steps_test3 E/AndroidRuntime: FATAL EXCEPTION: main
2    Process: com.example.steps_test3, PID: 28013
3    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.steps_test3/com.example.steps_test3.MainActivity}: io.realm.exceptions.RealmMigrationNeededException: Migration is required due to the following errors:
4    - Class 'Setting' has been added.
5        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
6        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
7        at android.app.ActivityThread.-wrap12(ActivityThread.java)
8        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
9        at android.os.Handler.dispatchMessage(Handler.java:102)
10        at android.os.Looper.loop(Looper.java:154)
11        at android.app.ActivityThread.main(ActivityThread.java:6119)
12        at java.lang.reflect.Method.invoke(Native Method)
13        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
14        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
15     Caused by: io.realm.exceptions.RealmMigrationNeededException: Migration is required due to the following errors:
16    - Class 'Setting' has been added.
17        at io.realm.internal.OsSharedRealm.nativeGetSharedRealm(Native Method)
18        at io.realm.internal.OsSharedRealm.<init>(OsSharedRealm.java:175)
19        at io.realm.internal.OsSharedRealm.getInstance(OsSharedRealm.java:251)
20        at io.realm.BaseRealm.<init>(BaseRealm.java:141)
21        at io.realm.BaseRealm.<init>(BaseRealm.java:108)
22        at io.realm.Realm.<init>(Realm.java:159)
23        at io.realm.Realm.createInstance(Realm.java:495)
24        at io.realm.RealmCache.createInstance(RealmCache.java:481)
25        at io.realm.RealmCache.doCreateRealmOrGetFromCache(RealmCache.java:448)
26        at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java:412)
27        at io.realm.Realm.getInstance(Realm.java:424)
28        at com.example.steps_test3.MainActivity.onCreate(MainActivity.java:49)
29        at android.app.Activity.performCreate(Activity.java:6679)
30        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
31        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
32        	... 9 more