致命错误：未捕获的错误：类'Mvc \ Library \ NotFoundException'-自动加载器

Question

我认为我的自动装带器可能无法正常工作。

我认为最安全的方法是向您显示我的目录。

这是我的自动装带器

    <?php
    // simple autoloader
    spl_autoload_register(function ($className) {
        if (substr($className, 0, 4) !== 'Mvc\\') {
            // not our business
            return;
        }

        $fileName = __DIR__.'/'.str_replace('\\', DIRECTORY_SEPARATOR, substr($className, 4)).'.php';

        if (file_exists($fileName)) {
            include $fileName;
        }
    });

    // get the requested url
    $url      = (isset($_GET['_url']) ? $_GET['_url'] : '');
    $urlParts = explode('/', $url);

    // build the controller class
    $controllerName      = (isset($urlParts[0]) && $urlParts[0] ? $urlParts[0] : 'index');
    $controllerClassName = '\\Mvc\\Controller\\'.ucfirst($controllerName).'Controller';

    // build the action method
    $actionName       = (isset($urlParts[1]) && $urlParts[1] ? $urlParts[1] : 'index');
    $actionMethodName = $actionName.'Action';

    try {
        if (!class_exists($controllerClassName)) {
            throw new \Mvc\Library\NotFoundException();
        }

        $controller = new $controllerClassName();

        if (!$controller instanceof \Mvc\Controller\Controller || !method_exists($controller, $actionMethodName)) {
            throw new \Mvc\Library\NotFoundException();
        }

        $view = new \Mvc\Library\View(__DIR__.DIRECTORY_SEPARATOR.'views', $controllerName, $actionName);
        $controller->setView($view);

        $controller->$actionMethodName();
        $view->render();

    } catch (\Mvc\Library\NotFoundException $e) {
        http_response_code(404);
        echo 'Page not found: '.$controllerClassName.'::'.$actionMethodName;
    } catch (\Exception $e) {
        http_response_code(500);
        echo 'Exception: <b>'.$e->getMessage().'</b><br><pre>'.$e->getTraceAsSt . ring().'</pre>';
    }

第30行引发错误，该错误将为throw new \Mvc\Library\NotFoundException();

它也这样说

  

堆栈跟踪：＃0 {main}

我在这里想念什么？

谢谢。