我在尝试cakephp，在网上找了个小例子，结果出现以下错误：

Warning: require(/home/liuhui/cake/app/models/note.php) [function.require]: failed to open stream: Permission denied in /home/liuhui/cake/cake/basics.php on line 70

Fatal error: require() [function.require]: Failed opening required '/home/liuhui/cake/app/models/note.php' (include_path='.:/usr/share/php:/usr/share/pear:/home/liuhui/cake:/home/liuhui/cake/app/') in /home/liuhui/cake/cake/basics.php on line 70

我用的cakephp版本是：1.1.8.3544，请问有人遇到过这个问题吗？