蛋糕蛋糕PHP显示内部服务器错误500

以下CakePHP代码在我的index.php文件中。当它在服务器上运行时，它会显示

内部服务器错误 500

if (!defined('DS')) {
    define('DS', DIRECTORY_SEPARATOR);
}

if (!defined('ROOT')) {
    define('ROOT', dirname(dirname(dirname(__FILE__))));
}
if (!defined('APP_DIR')) {
    define('APP_DIR', basename(dirname(dirname(__FILE__))));
}
$vendorPath = ROOT . DS . APP_DIR . DS . 'Vendor' . DS . 'cakephp' . DS . 'cakephp' . DS . 'lib';
$dispatcher = 'Cake' . DS . 'Console' . DS . 'ShellDispatcher.php';
if (!defined('CAKE_CORE_INCLUDE_PATH') && file_exists($vendorPath . DS . $dispatcher)) {
    define('CAKE_CORE_INCLUDE_PATH', $vendorPath);
}
if (!defined('WEBROOT_DIR')) {
    define('WEBROOT_DIR', basename(dirname(__FILE__)));
}
if (!defined('WWW_ROOT')) {
    define('WWW_ROOT', dirname(__FILE__) . DS);
}
if (php_sapi_name() === 'cli-server') {
    if ($_SERVER['REQUEST_URI'] !== '/' && file_exists(WWW_ROOT . $_SERVER['PHP_SELF'])) {
        return false;
    }
    $_SERVER['PHP_SELF'] = '/' . basename(__FILE__);
}
if (!defined('CAKE_CORE_INCLUDE_PATH')) {
    if (function_exists('ini_set')) {
        ini_set('include_path', ROOT . DS . 'lib' . PATH_SEPARATOR . ini_get('include_path'));
    }
    if (!include 'Cake' . DS . 'bootstrap.php') {
        $failed = true;
    }
} else {
    if (!include CAKE_CORE_INCLUDE_PATH . DS . 'Cake' . DS . 'bootstrap.php') {
        $failed = true;
    }
}
if (!empty($failed)) {
    trigger_error("CakePHP core could not be found. Check the value of CAKE_CORE_INCLUDE_PATH in APP/webroot/index.php. It should point to the directory containing your " . DS . "cake core directory and your " . DS . "vendors root directory.", E_USER_ERROR);
}
App::uses('Dispatcher', 'Routing');
$Dispatcher = new Dispatcher();
$Dispatcher->dispatch(
    new CakeRequest(),
    new CakeResponse()
);