missing controller error in cakephp

I am simply doing login and registration of users in cake php, here is my file structure!

app/controller/users_controller.php

<?php      class UsersController extends AppController {            public function beforeFilter() {              parent::beforeFilter();              $this->Auth->allow('add');            }          public function add() {              if(!empty($this->data)) {                  $this->User->create();                  if($this->User->save($this->data)) {                      $this->Session->SetFlash('User Created!');                      $this->redirect(array('action'=>'login'));                  }                  else {                      $this->Session->SetFlash('Please correct the errors!');                  }              }          }          public function login() {            }          public function logout() {              $this->redirect($this->Auth->logout());          }      }  ?>

app/app_controller.php

<?php      class AppController extends Controller {          public $components = array(              'Auth' => array(              'authorize'=>'controller'              ),              'Session'              );          public function isAuthorized() {              return true;          }      }  ?>

app/View/users/login.ctp

<?php      echo $this->Form->create(array('action'=>'login'));      echo $this->Form->inputs(array('legend'=>'Login','username','password'));      echo $this->Form->end('Login');  ?>

app/View/users/add.ctp

<?php      echo $this->Form->create();      echo $this->Form->inputs(array(          'legends' => 'Signup',          'username',          'password'));      echo $this->Form->end('Submit');  ?>

and i am browsing below URL

www.abc.com/../cakephp/users/add

i get below erros

Error: UsersController could not be found.

Error: Create the class UsersController below in file: app/Controller/UsersController.php

<?php  class UsersController extends AppController {    }

Notice: If you want to customize this error message, create app/View/Errors/missing_controller.ctp

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