Can't acccess personnal library

Hi all ,

I've just created a library called Cms and i've follow those steps : http://www.codeigniter.com/user_guide/ge...aries.html

When i try to access function in my library i obtain error :  PHP FATAL ERROR : Call to a member function getTags() on a non-object

The controller code is :

PHP Code:

$this->load->library('Cms');
 $pageName = "index";
 $data['cms'] = $this->Cms->getTags($pageName);
 $this->load->view('accueil', $data); 


My class is :

PHP Code:

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

class Cms {

        public function getTags($pageName)
        {
         $query = $this->db->query("SELECT * FROM cms WHERE 'page_name' = $pageName");

 foreach ($query->result_array() as $row)
 {
        return $row;
 }
        }
} 


I've checked many times mispelled word, but everything seems to be ok !!
I'm lost !
Thank for your help !