public synchronized Realm provideRealm(){
        if (mRealm == null){
            Realm.init(mContext);
            RealmConfiguration config = new RealmConfiguration.Builder()
                    .name("abcdef.realm")
                    .schemaVersion(5)
                    .deleteRealmIfMigrationNeeded()
                    .build();
            mRealm = Realm.getInstance(config);
        } else if (mRealm.isClosed()){
            mRealm = null;
            provideRealm();
        }
        return mRealm;
    }

Fatal Exception: io.realm.exceptions.RealmFileException
Unable to open a realm at path '/data/data/com.myapp.app/files/abcdef.realm': Incompatible histories. Expected a Realm with no or in-realm history. (Incompatible histories. Expected a Realm with no or in-realm history) (/data/data/com.myapp.app/files/abcdef.realm) in /home/cc/repo/realm/release/realm/realm-library/src/main/cpp/io_realm_internal_SharedRealm.cpp line 91