Zend FR

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Fatal error: require_once() [function.require]: Failed opening required 'Zend/Exception.php' (include_path='.;C:\php5\pear') in C:\wamp\www\exerciceZF\htdocs\index.php on line 4

<?php
// fichier d'appele initial

require_once('Zend/Exception.php') ;
require_once('Zend/Registry.php') ;
require_once('Zend/Db.php') ;
require_once('Zend/Config/Ini.php') ;
$config = new Zend_Config_Ini('/exerciceZF/htdocs/conf.ini',null,true) ;
$db = Zend_Db::factory($config->database);
Zend_Registry::set('db',$db) ;

// démarre le MVC sur l'appel de layout.phtml
require_once('Zend/Layout.php') ;
Zend_Layout::startMvc();

// lancement dela machinerie MVC de ZEND
require_once('Zend/Controller/Front.php') ;
$front = Zend_Controller_Front::getInstance();
$front->setControllerDirectory('../application/controllers');
$front->throwExceptions(true) ;
$front->dispatch() ;