Validation in Codeigniter + Grocery CRUD

Annotations.php

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

class Annotations extends MY_Controller {

    /**
     * Class Constructor
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();
        //  Setting the validation rules
        $this->setValidationRules( array(
            array(
                'field' => 'description'
                ,'label' => 'Description'
                ,'rules' => 'trim|required'
            ),
        ));
    }

    /**
     * Render CRUD from "tbsys_qualification" table in Database
     * @return void
     */
    public function index() {
        try {
            // If you use more than one databases
            $this->db = $this->load->database('default', true);
            //  Setting page title
            $this->util->set_title('Notes');

            $this->grocery_crud->columns('id', 'description')
                                ->set_table('annotations')
                                ->order_by('description', 'ASC')
                                ->set_subject('Annotations');

            if( in_array($this->grocery_crud->getState(), array('insert', 'insert_validation', 'update', 'update_validation')) ) {
                $this->grocery_crud->set_rules($this->getValidationRules());
            }

            $output = $this->grocery_crud->render();
            $this->load->view($output);

        }catch(Exception $e){
            show_error("Message: {$e->getMessage()}\n Trace as String: {$e->getTraceAsString()}");
        }
    }

}
/* End of file Annotations.php */
/* Location: .//D/projects/timeforteam/codigo/sistema/controllers/annotations.php */

MY_Controller.php

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

class MY_Controller extends CI_Controller {

    /**
     * Validation rules
     * @param array $_rules
     */
    private $_validationRules = array();

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

    /**
     * Getting the CRUD validation rules
     *
     * @return array
     */
    public function getValidationRules() {
        return $this->_validationRules;
    }

    /**
     * Setting the CRUD validation rules
     *
     * @param array $newvalidationRules Validation rules array
     */
    public function setValidationRules($_validationRules) {
        $this->_validationRules = $_validationRules;
        return $this;
    }

}

/* End of file MY_Controller.php */
/* Location: ./application/controllers/MY_Controller.php */

Real library Grocery CRUD is'nt used in this example.