来自另一个插件的CakePhp错误loadModel

Question

只需我的代码

    $this->loadModel('Documents.Document');
    debug($this->Document->_checkUserGroupPermission($docPerm, $uid));

错误staketrace是

DboSource->query('_checkUserGroup...', Array, Object(AppModel))
Model->__call('_checkUserGroup...', Array)
AppModel->_checkUserGroupPermission('guest')
[internal function]: EventsController->view('1')
ReflectionMethod->invokeArgs(Object(EventsController), Array)
Controller->invokeAction(Object(CakeRequest))
Dispatcher->_invoke(Object(EventsController), Object(CakeRequest))
dispatch(Object(CakeRequest), Object(CakeResponse))

我认为找不到Documents.Document模型