我是一名新手并尝试从cakephp cookbook运行bookmarker教程，但它显示以下错误：
theclownprince@theclownprince-K53SM:~/bookmarker/bin$ cake server
Error: Class ServerShell could not be loaded.
如果尝试从bookmarker文件夹运行它，则会显示不同的错误
theclownprince@theclownprince-K53SM:~/bookmarker$ bin/cake server
PHP Warning: require_once(/home/theclownprince/bookmarker/vendor/composer/autoload_real.php): failed to open stream: No such file or directory in /home/theclownprince/bookmarker/vendor/autoload.php on line 3
PHP Fatal error: require_once(): Failed opening required '/home/theclownprince/bookmarker/vendor/composer/autoload_real.php' (include_path='.:/usr/share/php:/usr/share/pear') in /home/theclownprince/bookmarker/vendor/autoload.php on line 3
感谢。