Errore fatale in Zend Server

[tulipan]

salve, ottengo il seguente errore:

Fatal error: require_once(): Failed opening required 'Zend/Loader' (include_path='D:\Zend\Apache2\htdocs\youspeaktozf \library\Zend\Loader') in D:\Zend\Apache2\htdocs\youspeaktozf\public\index.p hp on line 3


il codice di index.php è:

<?php
    set_include_path('D:\Zend\Apache2\htdocs\youspeaktozf\library\Zend\Loader');
    require_once('Zend/Loader');
    Zend_Loader::registerAutoload();
    $controller = Zend_Controller_Front::getInstance();
    $controller ->setControllerDirectory('..include/Controllers');
    $controller->dispatch();
    
    

?>

come posso risolvere il problema?