can't access app_controller.php

[bongsactu]

- In app_controller.php
<?php
class AppController extends Controller {
  var $components = array('RequestHandler', 'Session');
  var $helpers = array('Ajax', 'Form', 'Html', 'Javascript');

        function checkSession()
        {
                echo "aaa";
        }
}
?>

- In tasks_controller.php
class TasksController extends AppController {
  var $name = "Tasks";

        function beforeFilter() {
                $this->checkSession();
        }
}

In my computer, tasks_controller.php can access app_controller.php and
show "aaa", but when I test on another computer, tasks_controller.php
can not access app_controller.php ( not show "aaa" ) and blank page is
display

What should I do ?

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