get Realm file decryption failed

when i’m trying to use encrypt feature on my project, i get this error:

this is my Application class content:

/* SetUp Application database as encrypted contents */
byte[] key = new byte[64];
new SecureRandom().nextBytes(key);
Realm.init(this);
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder()
        .encryptionKey(key)
        .name("Application.db")
        .deleteRealmIfMigrationNeeded()
        .build();

full stack error:

Caused by: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.pishguy.androidapplication.cafemaku/files/Application.db': Realm file decryption failed. in /Users/emanuelez/repos/realm/realm-java-private/realm/realm-library/src/main/cpp/io_realm_internal_SharedRealm.cpp line 81 Kind: ACCESS_ERROR.

[Zhuinden]

… I’ve heard something about a “KeyStore” that you’re supposed to store things in on Android, but I don’t know much about it nor its reliability

[cmelchior]

You cannot delete a Realm while it is open and Realm.getDefaultInstance will open a Realm.

Do this instead:

Realm.deleteRealm(Realm.getDefaultConfiguration());