anchor.diff:    DateTime _lastUpdated;
     String _error;
     int _previousTimestamp;
  +  String _statusText;
   
     /// MODELS
     List<MessageElement> _messages;
  
positive.code: import 'package:campus_mobile_experimental/core/data_providers/user_data_provider.dart';
  import 'package:campus_mobile_experimental/core/models/message_model.dart';
  import 'package:flutter/material.dart';
  
negative.code:   //Fetch messages
    void fetchMessages() async {
      _isLoading = true;
      _statusText = NotificationsConstants.statusFetching;
      _error = null;
      notifyListeners();
      _previousTimestamp = DateTime.now().millisecondsSinceEpoch;
  