public function behaviors() {

        return [
            'contentNegotiator' => [
                'class' => ContentNegotiator::className(),
                'formats' => [
                    'application/json' => Response::FORMAT_JSON,
                    'application/xml' => Response::FORMAT_XML,
                ],
            ],
            'verbFilter' => [
                'class' => VerbFilter::className(),
                'actions' => $this->verbs(),
            ],
        ];
    }

以下Error信息, 这个配置有问题吗?这个类不是框中的吗?怎么会在这里找? Class 'api\modules\v1\controllers\ContentNegotiator' not found