无法使用模块解决Yii中的请求

这是我的控制器

class CarsController extends Controller {
    public function actionIndex() {
       echo 1; exit();
    }
}

这是模块文件：

<?php
class CarsModule extends CWebModule {
    public $defaultController = "cars";
    public function init() {
        // this method is called when the module is being created
        // you may place code here to customize the module or the application
        // import the module-level models and components
        $this->setImport(array(
            'cars.models.*',
            'cars.components.*',
        ));
    }
    public function beforeControllerAction($controller, $action) {
        if (parent::beforeControllerAction($controller, $action)) {
            // this method is called before any module controller action is performed
            // you may place customized code here
            return true;
        }
        else
            return false;
    }
}

我的问题是，如果我访问我的项目，比如：localhost/cars，它就可以工作了。如果我访问localhost/cars/index，我将收到以下消息：无法解决请求。如果我创建了一个新函数，并像这样访问：localhost/cars/myfunction，仍然是一样的。我在Windows上工作。有人能帮我吗？