Class 'Tracker' not found

I'am using namespace in my controllers , this is my controller :
[controllers/admin/AdminController.php]

theme = Theme::uses('admin');
$visitor = Tracker::currentSession();
dd($visitor);
}

public function getIndex() {
$the_title = trans("admin.labels.dashboard");
return $this->theme->scope('index',compact('the_title'))
->render();
}
```

}

Begin with controllers/admin/AdminController.php and the Tracker::currentSession() call; reproduce the class-resolution error in the controller and inspect the project's Tracker entry point. Done means the namespaced controller resolves Tracker and currentSession() executes without the reported "Class 'Tracker' not found" error.

Written by the indexing model from the issue text.