begining with cake

I just installed cakephp and made my first model, controller and view.
It seems that the controller can't find its model. Since it's a
spanish name Usuarios, I tried different inflections and didnt work
out.

This is the code. It can't be simpler!

----------------- UsuariosController.php

class UsuariosController extends AppController {

function index() {
//obtiene todos los ingredientes y los pasa a la vista:
$usuarios = $this->Usuarios->find('all');
$this->set('usuarios', $usuarios);
}
}

--------------------- Usuario.php
class Usuario extends AppModel {

}

And the result is the following...

Notice (8): Undefined property: UsuariosController::$Usuarios [APP/
controllers/usuarios_controller.php, line 7]

Code

function index() {
//obtiene todos los ingredientes y los pasa a la vista:
$usuarios = $this->Usuarios->find('all');

UsuariosController::index() - APP/controllers/usuarios_controller.php,
line 7
Object::dispatchMethod() - CORE/cake/libs/object.php, line 115
Dispatcher::_invoke() - CORE/cake/dispatcher.php, line 227
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 194
[main] - APP/webroot/index.php, line 88

Fatal error: Call to a member function find() on a non-object in /var/
www/pacex/app/controllers/usuarios_controller.php

Somebody help me , please!!!

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