Call to a member function run() on a non-object code igniter - codeigniter-2

Question

I am trying to design a user registration form using code igniter 2.1.0. I have used the following code in the regitration.php in controllers to add users.
class Registration extends CI_Controller
{
function __construct() {
parent::__construct();
}
function index()
{
$data['main_content'] = 'registration';
// Checks to see if form validation rules were met an executed properly. If not, will return with registration form.
if ($this->form_validation->run('registration') === FALSE)
{
$data ['title'] = 'Registration';
$this->load->view('include/template', $data);
}
// If validation passes, information will be passed along to the MODEL to be processed and the account will be created.
else
{
$this->load->model('registration_model');
$this->registration_model->addUser();
$this->session->set_flashdata('success', 'Your account has been successfully created');
redirect(uri_string());
}
}
}
But it showed me an error of Call to a member function run() on a non-object. How do i correct that?

Answer 1

Please include
// load 'form' helper
$this->load->helper('form');
// load 'validation' class
$this->load->library('form_validation');
and try now
function __construct() {
// load controller parent
parent::__construct();
// load 'url' helper
$this->load->helper('url');
// load 'form' helper
$this->load->helper('form');
// load 'session'
$this->load->library('session');
// load 'validation' class
$this->load->library('form_validation');
}
It seems like $session class is not initializing correctly.
Check for default_ci_sessions table, if you are using sessions for database.
Check if the constructor is loading sessions library.
Check if session is in autoload.php config
For this "In order to use the Session class you are required to set an encryption key in your config file.".
add this to your config.php
$config['encryption_key'] = 'your_encryption_key_here';