SendGrid + CodeIgniter

email.php

<?php

/* application/config/email.php */

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

/*
|--------------------------------------------------------------------------
| SendGrid Setup
|--------------------------------------------------------------------------
|
| All we have to do is configure CodeIgniter to send using the SendGrid
| SMTP relay:
*/
$config['protocol']	= 'smtp';
$config['smtp_port']	= '587';
$config['smtp_host']	= 'smtp.sendgrid.net';
$config['smtp_user']	= 'your_sendgrid_username';
$config['smtp_pass']	= 'your_sendgrid_password';

welcome.php

<?php

/* application/controllers/welcome.php */

public function index()
{
	$this->load->library('email');

	$this->email->from('john.doe@example.com', 'John');
	$this->email->to('jane.doe@example.com');
	$this->email->subject('Test Email using SendGrid');
	$this->email->message('This email was delivered by your friends at SendGrid');

	$this->email->send();

	$this->load->view('welcome_message');
}

Can't work This Code

Showing This error "No direct script access allowed".