token - class.phpmailer.php not in a defined site error -

even though had saved phpmailer_5.2.4 file inside codeigniter_2.2.0, showing class.phpmailer.php not there in local disk. , have confirmed class.phpmailer.php there in phpmailer_5.2.4.

my code follows:

<?php if ( ! defined('basepath')) exit('no direct script access allowed'); require('phpmailer_5.2.4/class.phpmailer.php'); class site extends ci_controller {  public function __construct(){         parent::__construct();         $this->load->model('site_model');         //$this->load->helper('url');     }     public function index(){         $this->load->view('welcome');     }     public function view(){         $this->load->view('registration');     }     public function generate_token ($len){         // array of potential characters, shuffled.         $chars = array(             'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',              'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',             'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',              'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',             '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'         );         shuffle($chars);          $num_chars = count($chars) - 1;         $token = '';          // create random token @ specified length.         ($i = 0; $i < $len; $i++){             $token .= $chars[mt_rand(0, $num_chars)];         }         return $token;     }     public function insert(){         $token=$this->generate_token(7);         $this->load->site_model->insert($token);     } } 

when require file in codeigniter's controller, file require (phpmailer_5.2.4/class.phpmailer.php) should in same directory current file (i guess controller file site.php), directory structure should this:

/ci-dir/application [dir] /ci-dir/application/controllers [dir] /ci-dir/application/controllers/site.php /ci-dir/application/controllers/phpmailer_5.2.4 [dir] /ci-dir/application/controllers/phpmailer_5.2.4/class.phpmailer.php /ci-dir/application/controllers/... /ci-dir/application/controllers/models ... /ci-dir/system 

if not case, , phpmailer_5.2.4 directory not inside controllers directory, should change require require correct location.