The crash of the application when the onClick method is triggered

I'm trying to encrypt the aes256 message and send it to the firebase, but something goes wrong. Crash here

byte[] shifr = aes256.makeAes(msg.getBytes(), Cipher.ENCRYPT_MODE); //Вот тут вылетает my_ref.push().setValue(shifr); 

My code is:

 public class MainActivity extends AppCompatActivity { private static int max_message_length = 150; FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference my_ref = database.getReference("messages"); EditText m_edit_text_message; Button m_send_button; RecyclerView m_messages_recycler; ArrayList<String> messages = new ArrayList<>(); Aes_256_Class aes256 = new Aes_256_Class(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); m_send_button = findViewById(R.id.send_message_b); m_edit_text_message = findViewById(R.id.message_input); m_messages_recycler = findViewById(R.id.message_recycle); m_messages_recycler.setLayoutManager(new LinearLayoutManager(this)); final Data_Adapter data_adapter = new Data_Adapter(this, messages); m_messages_recycler.setAdapter(data_adapter); m_send_button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String msg = m_edit_text_message.getText().toString().trim(); if (msg.equals("")){ Toast.makeText(getApplicationContext(),"***",Toast.LENGTH_SHORT).show(); return; } if (msg.equals("Я булка")){ Toast.makeText(getApplicationContext(),"*** )))",Toast.LENGTH_SHORT).show(); return; } if (msg.length()> max_message_length){ Toast.makeText(getApplicationContext(),"Слишком длинное сообщение",Toast.LENGTH_SHORT).show(); return; } String mes = msg; byte[] shifr = aes256.makeAes(mes.getBytes(), Cipher.ENCRYPT_MODE); //Вот тут вылетает my_ref.push().setValue(shifr); m_edit_text_message.setText(""); } }); my_ref.addChildEventListener(new ChildEventListener() { @Override public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) { String msg = dataSnapshot.getValue(String.class); messages.add(msg); data_adapter.notifyDataSetChanged(); m_messages_recycler.smoothScrollToPosition(messages.size()); } @Override public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s) { } @Override public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) { } @Override public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s) { } @Override public void onCancelled(@NonNull DatabaseError databaseError) { } }); } } 

Logs:

  2019-05-10 15:19:59.660 1148-1451/? E/WifiVendorHal: getWifiLinkLayerStats(l.939) failed {.code = ERROR_NOT_SUPPORTED, .description = } 2019-05-10 15:19:59.674 1148-1451/? E/WificondControl: Noise: 0, Snr: -1, Chload: -1 2019-05-10 15:20:00.042 1545-1545/? E/DateView: DateView,mCurrentTime: 1557490800042 2019-05-10 15:20:00.074 1545-1545/? E/LocalCalendar: invalid param calendarId. 2019-05-10 15:20:00.663 8443-8443/com.example.batth.govno E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.batth.govno, PID: 8443 com.google.firebase.database.DatabaseException: Serializing Arrays is not supported, please use Lists instead at com.google.android.gms.internal.firebase_database.zzkt.zzi(Unknown Source:246) at com.google.android.gms.internal.firebase_database.zzkt.zzh(Unknown Source:0) at com.google.firebase.database.DatabaseReference.zza(Unknown Source:10) at com.google.firebase.database.DatabaseReference.setValue(Unknown Source:7) at com.example.batth.govno.MainActivity$1.onClick(MainActivity.java:74) at android.view.View.performClick(View.java:6648) at android.view.View.performClickInternal(View.java:6620) at android.view.View.access$3100(View.java:787) at android.view.View$PerformClick.run(View.java:26167) at android.os.Handler.handleCallback(Handler.java:891) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:207) at android.app.ActivityThread.main(ActivityThread.java:7539) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:958)