RESTFull错误要怎么返回json[2.0]

我开启了restfunll API 数据返回和验证都没有问题了，
config里也配置了

return [
    // ...
    'components' => [
        'response' => [
            'class' => 'yii\web\Response',
            'on beforeSend' => function ($event) {
                $response = $event->sender;
                if ($response->data !== null && Yii::$app->request->get('suppress_response_code')) {
                    $response->data = [
                        'success' => $response->isSuccessful,
                        'data' => $response->data,
                    ];
                    $response->statusCode = 200;
                }
            },
        ],
    ],
];

但是就是访问的路径不存在的时候，返回的还是html
因为配置里

'errorHandler' => [
    'errorAction' => 'site/error',
],

所以会去找site/error
我在 SiteController.php中写了

public function actionError(){

        return ['status'=>'fail','msg'=>'load 错误'];
        if($error=Yii::app()->errorHandler->error)
        {
            return $error;
        }
    }

提示找不到error.php view
目前金钱 只有 5

???????????