我正在使用Zend Framework描述，我正在尝试自定义 Headers 标签，如ZF2 documetation推荐，但我有这个错误：

未捕获的Zend \ ServiceManager \ Exception \ ServiceNotFoundException：无法将服务“viewHelperManager”解析为工厂;你确定你在配置期间提供了吗？在/var/www/html/basketmetrics/vendor/zendframework/zend-servicemanager/src/ServiceManager.php:681堆栈跟踪：＃0 / var / www / html / basketmetrics / vendor / zendframework / zend-servicemanager / src / ServiceManager .php（757）：Zend \ ServiceManager \ ServiceManager-> getFactory（'viewHelperManag ...'）1 /var/www/html/basketmetrics/vendor/zendframework/zend-servicemanager/src/ServiceManager.php(200):Zend \ ServiceManager \ ServiceManager-> doCreate（'viewHelperManag ...'）＃2 /var/www/html/basketmetrics/module/Stats/src/Module.php(43）：Zend \ ServiceManager \ ServiceManager-> get（'viewHelperManag ...'）＃3 /var/www/html/basketmetrics/vendor/zendframework/zend-eventmanager/src/EventManager.php(322）：Stats \ Module-> setLayoutTitle（Object（Zend \ Mvc \ MvcEvent））＃ 4 /var/www/html/basketmetrics/vendor/zendframework/zend-eventmanager/src/EventManager.php(171）：/ var / www / html / basketmetrics / vendor / zendframework / zend-servicemanager /中的Zend \ EventManager \ E第681行的src / ServiceManager.php

这是我在Module.php上的代码

namespace Stats;

class Module
{
    const VERSION = '3.0.2';

    public function getConfig()
    {
        return include __DIR__ . '/../config/module.config.php';
    }

    /**
     * @param  \Zend\Mvc\MvcEvent $e The MvcEvent instance
     * @return void
     */
    public function onBootstrap($e)
    {
        // Register a render event
        $app = $e->getParam('application');
        $app->getEventManager()->attach('render', array($this, 'setLayoutTitle'));
    }

    /**
     * @param  \Zend\Mvc\MvcEvent $e The MvcEvent instance
     * @return void
     */
    public function setLayoutTitle($e)
    {
        $matches    = $e->getRouteMatch();
        $action     = $matches->getParam('action');
        $controller = $matches->getParam('controller');
        $module     = __NAMESPACE__;
        $siteName   = 'BasketMetrics';

        // Getting the view helper manager from the application service manager
        $viewHelperManager = $e->getApplication()->getServiceManager()->get('viewHelperManager');

        // Getting the headTitle helper from the view helper manager
        $headTitleHelper   = $viewHelperManager->get('headTitle');

        // Setting a separator string for segments
        $headTitleHelper->setSeparator(' - ');

        // Setting the action, controller, module and site name as title segments
        $headTitleHelper->append($action);
        $headTitleHelper->append($controller);
        $headTitleHelper->append($module);
        $headTitleHelper->append($siteName);
    }    

}

我不知道如果我做错了什么，或者我不能像ZF2那样做 .

和元标记“描述”我该如何自定义？

zend-framework3