It is impossible to make the notification

[Hugilore111]

Hello everybody
I have a problem
It is impossible to make the notification
My code does not work

<?php
Controller
class Example_ControllerPublic_Test extends XenForo_ControllerPublic_Abstract
{
    public function actionTest()
    {
        $messageCount= 3;
        $viewParams = array(
         'messageCount'=>$messageCount,
        );
      
      
        return $this->responseView('Example_ViewPublic_Test', 'template',$viewParams);
          
      
    }
}

Template

<span class="itemCount{xen:if {$messageCount}, 'alert'}">{$messageCount}</span>