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在cakephp 2.1中有什么区别$this->data和$this->request->data？

在CakePHP 2 book/Acl Tutorial/Part 2中,我正在执行命令:

./Console/cake AclExtras.AclExtras aco_sync

我收到一个警告错误:

Warning Error: Argument 1 passed to Component::startup() must be an instance of Controller, 
null given, called in 
/opt/lampp/htdocs/acl/app/Plugin/AclExtras/Console/Command/AclExtrasShell.php 
on line 80 and defined in [/opt/lampp/htdocs/acl/lib/Cake/Controller/Component.php, line 119]

该ACOS表获取与居住NULL在model外地,并NULL在所有的领域foreign_key.

我该如何解决这个错误？

谢谢