Unable to locate the specified class: Session.php

Hi! I've been struggling trying to figure out what's going on to my code.
I updated CI version of a application from 2x to the latest one available. This app uses tank_auth and grocery_crud. I'm aware that tank_auth is not fully compatible with CI 3x (there is no official updates to CI 3). About crud, I updated it to its latest version as well.
Finishing setting up CI and going through the Upgrading Documentation I went to test my application and here we go, it keeps me returning this error message: 

Unable to locate the specified class: Session.php

My session config:

PHP Code:

$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'ci_sessions_sas';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = 'ci_sessions_sas';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE; 


My autoload:

PHP Code:

$autoload['drivers'] = array('session'); 


My Home class Controller:

PHP Code:

<?php
    if (!defined('BASEPATH'))
        exit('No direct script access allowed');

    class Home extends MY_Controller {
        public $data = array();

        function __construct() {
            parent::__construct();

            $this->load->library('menu');
            $menu = new menu();
            $this->data['menu'] = $menu->getMenu();
        }

        public function index() {
            $this->data['user'] = $this->session->userdata('username');
            $this->data['slug'] = 'home';
            $this->load->view('layout', $this->data);
        }
    } 


Menu library:

PHP Code:

<?php
    if (!defined('BASEPATH'))
        exit('No direct script access allowed');

    class Menu extends MY_Controller{
        function __construct() {
            parent::__construct();
            $this->load->model('menu_model', 'menu');
        }

        public function getMenu() {
            $menu = array();
            $model = new Menu_model();

            $perfil = $this->getPerfilUser();

            $modulos = $model->getModulos($perfil);
            $funcoes = $model->getFuncoes($perfil);

            for ($i = 0; $i < sizeof($modulos); $i++) {
                $menu[$i]['nome'] = $modulos[$i]['modulo_nome'];
                for ($j = 0; $j < sizeof($funcoes); $j++) {
                    if ($menu[$i]['nome'] == $funcoes[$j]['modulo_nome']) {
                        $menu[$i]['funcoes'][$j] = $funcoes[$j];
                    }
                }
            }
            return $menu;
        }

        function getPerfilUser() {
           //return $this->session->userdata['user_id_perfil'];
        }

        function getIdUser() {
            //return $this->session->userdata['user_id'];
        }

        function exibirMenu() {
            echo '<pre>';
                print_r($this->getMenu());
            echo '</pre>';
        }
    } 


I thought the problem could be the tank_auth library, so I removed it completely. The problem persisted.
In my Home Controller when I comment the lines:

PHP Code:

$this->load->library('menu');
$menu = new menu();
$this->data['menu'] = $menu->getMenu(); 


I guess the problem is related with the Home class, but I can't figure it out. 

Attached Files

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