Fatal error: Call to undefined method on specific line - php

Question

Codeigniter throw the next error when trying to render the register page. It looks like the method Register::render() is not defined on line 21 but i don't understand the problem at all
The Register.php file
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Register extends MY_Controller
{
public function index()
{
$this->load->library('form_validation');
$this->form_validation->set_rules('first_name', 'First name','trim|required');
$this->form_validation->set_rules('last_name', 'Last name','trim|required');
$this->form_validation->set_rules('username','Username','trim|required|is_unique[users.username]');
$this->form_validation->set_rules('email','Email','trim|valid_email|required');
$this->form_validation->set_rules('password','Password','trim|min_length[8]|max_length[20]|required');
$this->form_validation->set_rules('confirm_password','Confirm password','trim|matches[password]|required');
if($this->form_validation->run()===FALSE)
{
$this->load->helper('form');
$this->render('register/index_view');
}
else
{
$first_name = $this->input->post('first_name');
$last_name = $this->input->post('last_name');
$username = $this->input->post('username');
$email = $this->input->post('email');
$password = $this->input->post('password');
$additional_data = array(
'first_name' => $first_name,
'last_name' => $last_name
);
$this->load->library('ion_auth');
if($this->ion_auth->register($username,$password,$email,$additional_data))
{
$_SESSION['auth_message'] = 'The account has been created. You may now login.';
$this->session->mark_as_flash('auth_message');
redirect('user/login');
}
else
{
$_SESSION['auth_message'] = $this->ion_auth->errors();
$this->session->mark_as_flash('auth_message');
redirect('register');
}
}
}
}

Answer 1

You should use:
$this->load->view('register/index_view');
When I started with codeigniter I had a similar issue. Render() is used by some libraries and, like you, I followed a tutorial, but there was nothing about that library. After a while I saw some comments in that article and I found out about render(). If you want to use this, try to find some library that has it implemented.