java.lang.ClassCastException: com.example.RealmInteger cannot be cast to io.realm.internal.RealmObjectProxy

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ClassCastException when trying to convert a field from int to integer list

com.example.RealmInteger cannot be cast to io.realm.internal.RealmObjectProxy

java.lang.ClassCastException: com.example.RealmInteger cannot be cast to io.realm.internal.RealmObjectProxy	at io.realm.DynamicRealmObject.setList(DynamicRealmObject.java:602)	at com.example.RealmHelper$Migration$1.apply(RealmHelper.java:132)	at io.realm.RealmObjectSchema.transform(RealmObjectSchema.java:475)	at com.example.RealmHelper$Migration.migrate(RealmHelper.java:126)	at io.realm.BaseRealm$3.onResult(BaseRealm.java:705)	at io.realm.RealmCache.invokeWithGlobalRefCount(RealmCache.java:267)	at io.realm.BaseRealm.migrateRealm(BaseRealm.java:685)	at io.realm.Realm.migrateRealm(Realm.java:1221)	at io.realm.Realm.migrateRealm(Realm.java:1208)	at io.realm.Realm.createInstance(Realm.java:235)	at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java:126)	at io.realm.Realm.getDefaultInstance(Realm.java:174)	at com.example.RealmHelper.init(RealmHelper.java:86)	at com.example.AppApplication.onCreate(AppApplication.java:95)	at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1014)	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4751)