form not found (hiérarchie model)

salut à tous,

je serai vraiment reconaissant si vous pouvez m’aider a propos d’un petit probeleme

Fatal error: Class 'Application_Form_Book' not found in D:\wamp\www\application\modules\admin\controllers\BookController.php on line 8

hiérarchie

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>application
    >configs
               ->application.ini 
    >layouts
    > modules
                > admin
                     > controllers
                               -> BookController.php
                     > forms
                               -> Book.php
                     > models
                              > DbTable
                                        -> Book.php
                     > views
                     -> Bootstrap.php(1)
                > default
     -> Bootstrap.php(0)

> admin
> controllers
-> BookController.php

Code:

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<?php

class Admin_BookController extends Zend_Controller_Action
{

    function addAction()
    {   
        $form = new Application_Form_Book();
        $form->envoyer->setLabel('Ajouter');
        $this->view->form = $form;
    
        if ($this->getRequest()->isPost())
       {
            $formData = $this->getRequest()->getPost();
            if ($form->isValid($formData)) {
                $title = $form->getValue('title');
                $author = $form->getValue('author');       
                $books = new Library_Model_ListBooks();
                $books->addBook($title, $author);
    
                $this->_helper->redirector('index');
            } else {
                $form->populate($formData);
            }
        }   
    }
}

> admin
> models
> DbTable
-> Book.php

Code:

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<?php
 
class Application_Model_DbTable_Books extends Zend_Db_Table_Abstract
{
    protected $_name = 'Books';
 
    public function addBook($title, $author)
    {
        $data = array(
            'title' => $title,
            'author' => $author,
        );
        $this->insert($data);
    }
}

> admin
> forms
-> Book.php

Code:

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<?php
 
class Application_Form_Book extends Zend_Form
{
    public function init()
    {
        $this->setName('Book');
 
        $id = new Zend_Form_Element_Hidden('id');
        $id->addFilter('Int');
 
        $artiste = new Zend_Form_Element_Text('title');
        $artiste->setLabel('Title')
                ->setRequired(true)
                ->addFilter('StripTags')
                ->addFilter('StringTrim')
                ->addValidator('NotEmpty');
 
        $titre = new Zend_Form_Element_Text('author');
        $titre->setLabel('Author')
              ->setRequired(true)
              ->addFilter('StripTags')
              ->addFilter('StringTrim')
              ->addValidator('NotEmpty');
 
        $envoyer = new Zend_Form_Element_Submit('envoyer');
        $envoyer->setAttrib('id', 'boutonenvoyer');
 
        $this->addElements(array($id, $title, $author, $envoyer));
    }
}

merci d'avance