Why does the Firebase Database encountered an OutOfMemoryError application crash?

Question

Android

Good afternoon. An error occurs - java.lang.RuntimeException: Firebase Database encountered an OutOfMemoryError. You may need to reduce the amount of data you are syncing to the client (eg by using queries or syncing a deeper path).

public class FragmentFireBaseMessageTreeView extends Fragment implements ChildEventListener{
 @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {

        iChildClickFireBaseFragment = (IChildClickFireBaseFragment)getFragmentManager().findFragmentById(R.id.contentMain);
        View rootView = inflater.inflate(R.layout.fragment_firebase_message,container,false);
        expandableListView = rootView.findViewById(R.id.exListView);

        notificationsGroup = new LinkedHashMap<>();
        notificationsGroup.put(WEB, notificationsListWeb);
        notificationsGroup.put(ODIN_C, notificationsList1c);
        notificationsGroup.put(MEscort, notificationsListMEscort);
        adapter = new FireBaseMessageExpAdapter(getActivity(),notificationsGroup);
        expandableListView.setAdapter(adapter);

        databaseRef = FirebaseDatabase.getInstance().getReference().child("notifications");
        region = App.getRegion(getActivity());
        token = FirebaseInstanceId.getInstance().getToken();
        code = App.get(getActivity()).getCodeAgent();
        Query queryToAll = databaseRef.orderByChild("to").equalTo("/topics/all").limitToFirst(10);
        Query queryToCity = databaseRef.orderByChild("to").equalTo("/topics/"+region).limitToFirst(10);
        Query queryToCodeAndRegion = databaseRef.orderByChild("code").equalTo(region+"_"+code).limitToFirst(10);
queryToCodeAndRegion.addChildEventListener(this);
        queryToAll.addChildEventListener(this);
        queryToCity.addChildEventListener(this);
        expandableListView.setOnChildClickListener(this);
        dialog = new ProgressDialog(getActivity());
        dialog.setMessage("Please wait...");
        dialog.show();
        return rootView;
}

@Override
    public void onChildAdded(DataSnapshot dataSnapshot, String s) {
        if (dataSnapshot.hasChildren()){
            FireBaseNotification notification = dataSnapshot.getValue(FireBaseNotification.class);
addNotificationForAdapter(notification,dataSnapshot);
}
dialog.dismiss();
}

private void addNotificationForAdapter(FireBaseNotification notification,DataSnapshot dataSnapshot){
        if (notification != null) {
            notification.setId(dataSnapshot.getKey());
            switch (notification.getTag()){
                case WEB:
                    notificationsListWeb.add(notification);
                    notificationsGroup.put(WEB, notificationsListWeb);
                    break;
                case ODIN_C:
                    notificationsList1c.add(notification);
                    notificationsGroup.put(ODIN_C, notificationsList1c);
                    break;
                case MEscort:
                    notificationsListMEscort.add(notification);
                    notificationsGroup.put(MEscort, notificationsListMEscort);
                    break;
            }
            adapter.notifyDataSetChanged();
        }
    }

Actually, I’ll add to all this that for this month the download quota has been exceeded and it is proposed to switch to a paid tariff. Could it be because of this??