原则错误:找不到类“原则ORM实体存储库”

我是教义新手，我正在遵循文档中的示例。当我创建一个存储库类（例如UserRepository.php）并尝试扩展EntityRepository类时，我收到以下错误消息：致命错误：在第10行的C：''xampp''htdocs''excap''repositories''UserRepository.php中找不到类'Doctrine''ORM''EntityRepository'

这是我的存储库类：

use Doctrine'ORM'EntityRepository;
/**
 * Description of UserRepository
 *
 * @author Mario
 */
class UserRepository extends EntityRepository
{ 

我做错了什么？（顺便说一下，我用作曲家安装了Doctrine2）

<?php
//bootstrap_doctrine.php
$isDevMode = true;
use Doctrine'ORM'Tools'Setup;
require_once 'vendor/autoload.php';
$config = Setup::createAnnotationMetadataConfiguration(array(__DIR__.'/entities'), $isDevMode);
$conn = array(
    'driver' => 'pdo_mysql',
    'user' => 'mydbuser',
    'password' => 'mydbpassword',
    'dbname' => 'mydbname'
);
$entityManager = 'Doctrine'ORM'EntityManager::create($conn, $config);
?>

<?php
//boostrap.php
//Entities
require_once 'entities/User.php';
require_once 'entities/Gender.php';
require_once 'entities/AccessPoint.php';
//Repositories
require_once 'repositories/UserRepository.php';
if(!class_exists("Doctrine'Common'Version", FALSE))
{
    require_once 'bootstrap_doctrine.php';
}
?>

<?php
// autoload.php generated by Composer
if (!class_exists('Composer''Autoload''ClassLoader', false)) {
    require __DIR__ . '/composer' . '/ClassLoader.php';
}
return call_user_func(function() {
    $loader = new 'Composer'Autoload'ClassLoader();
    $composerDir = __DIR__ . '/composer';
    $map = require $composerDir . '/autoload_namespaces.php';
    foreach ($map as $namespace => $path) {
        $loader->add($namespace, $path);
    }
    $classMap = require $composerDir . '/autoload_classmap.php';
    if ($classMap) {
        $loader->addClassMap($classMap);
    }
    $loader->register();
    return $loader;
});
?>