По какой причине может не отвечать контроллер компоненты на хостинге? - Joomla 1.5: Общие вопросы

<?php
/**
  */

// no direct access

defined( '_JEXEC' ) or die( 'Restricted access' );

jimport('joomla.application.component.controller');
require_once( JPATH_COMPONENT.DS.'views\\vbuy\\view.html.php' );


/**
 * Hello World Component Controller
 *
 * @package    Joomla.Tutorials
 * @subpackage Components
 */
class AccountControllerBuy extends JController
{
    /**
     * Method to display the view
     *
     * @access    public
     */
function display()
    {
        parent::display();
    }

function __construct()
{
    parent::__construct();

    $this->registerTask( 'buy'  , 'buy' );
}    
function buy()
    {
     
 		
 		JRequest::setVar( 'view', 'Vbuy' );
 		$view = JRequest::getVar('view', 'Vbuy');
 		$inp = JRequest::getInt('ammount');
 		if ($inp >0){
 		$vn = 'AccountView'.$view ;
 		$model = &$this->getModel( $view ) ;
		if (!JError::isError( $model )) {
	 		$v = new $vn( $inp) ; 
			$v->setModel( $model, true );
			$v->display();
		}
		}
    }

}
?>

<?php

// Check to ensure this file is included in Joomla!

defined
('_JEXEC') 
or 
die();

jimport( 'joomla.application.component.model' );

/**
 * Hello Model
 *
 * @package    Автор
 * @subpackage Components
 */
class AccountModelVbuy extends JModel
{
    /**
    * Gets the greeting
    * @return string The greeting to be displayed to the user
    */
   // public $user ; 

   /* function getUser(){
    	return $this->user;
    }
    */
    function getScore()
    {
 	   	$db = JFactory::getDBO();

  	 	$query = 'SELECT summ FROM account';
   		$db->setQuery( $query );
   		$greeting = $db->loadResult();
				
		   return $greeting;
		 }
    function setScore($sco)
    {
 	   	$db = JFactory::getDBO();
 	   	$sum = AccountModelVbuy::getScore();
			if ($sum < $sco){
		  	 	$query = 'UPDATE account SET summ = 10000';
   				$db->setQuery( $query );
   				$res = $db->query();
			} else {
				  $sum -=$sco;
	  		 	$query = 'UPDATE account SET summ ='.$sum ;
  	 			$db->setQuery( $query );
   				$res = $db->query();
			}
		   return $res;
		 }

    function buy($cred)
    {
    	$score = AccountModelVbuy::setScore($cred);

	   		$db = JFactory::getDBO();
				$date = date("j.F.Y.") ;
				$time = date("h:i:s") ;
				$pass = mt_rand(1,100000);
 				$user = array ("id" => 0, "time" => $time, "date" => $date, "pass" => $pass, "cred" => $cred);
 				//$this->user = $user;
   	 		$query = 'INSERT INTO user_c (time, pass, cred) VALUES(CURDATE(),'.$pass.','.$cred.')';
   			$db->setQuery( $query );
 				if (!$db->query()) {
  				echo $db->stderr();
				} else {
  				$id = $db->insertid();
  				$sc = AccountModelVbuy::getScore();
  				$user = array ("id" => $id, "time" => $time, "date" => $date, "pass" => $pass, "cred" => $cred, "score" => $sc);
  			//	$this->user = $user;
				}
		   return $user;
    }
}
?>