Cake 2.1 admin layout is not working

I have this:
In routes.php: Router::connect('/admin', array('controller' => 'users', 'action' => 'index','add', 'admin' => true,'prefix' => 'admin','layout' => 'admin'));

In core.php: (debug, 0)

In appController:
class AppController extends Controller {
public $components = array(
'Session',
'Auth'=>array(
'loginRedirect'=>array('controller'=>'pagina_inicial', 'action'=>'index','admin'=>false),
'logoutRedirect'=>array('controller'=>'users', 'action'=>'login'),
'authError'=>" ",
'authorize'=>array('Controller')
)
);

public $helpers = array('Session','form','Html','PhpExcel');
public $pdfConfig = array(
'engine' => 'CakePdf.Tcpdf',
);

public $cacheAction = '1 hour';

public function isAuthorized($user) {
$role=$this->Session->read('Auth.User.role');

//die(debug($role));
if(isset($this->request->prefix) && $role!='admin'){
return FALSE;
}
return true;
}

public function beforeFilter() {
$this->Auth->allow('*');
//$this->set('logged_in', $this->Auth->loggedIn());
//$this->set('current_user', $this->Auth->user());

// if its the administrator/manager – change the layout
/**if (isset($this->params['prefix']) && $this->params['prefix'] == 'admin') {
$this->layout = 'admin';
} else {
$this->layout = 'user';
}**/

}
public function beforeRender() {
$this->_configureErrorLayout();
}

public function _configureErrorLayout() {
if ($this->name == 'CakeError') {
if ($this->_isAdminMode()) {
$this->layout = 'admin';
} else {
$this->layout = 'default';
}
}
}

public function _isAdminMode() {
$adminRoute = Configure::read('Routing.prefixes');
if (isset($this->params['prefix']) && in_array($this->params['prefix'], $adminRoute)) {
return true;
}
return false;
}

also have:

app/view/layout/default.ctp and app/view/layout/admin.ctp
app/view/Homepage/index.ctp and app/view/HomePage/admin_index.ctp

But not working, what am I doing wrong, any help please.

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