我在config/app_local.php中有这样的代码：

return [
    /*
     * Debug Level:
     *
     * Production Mode:
     * false: No error messages, errors, or warnings shown.
     *
     * Development Mode:
     * true: Errors and warnings shown.
     */
    'debug' => filter_var(env('DEBUG', true), FILTER_VALIDATE_BOOLEAN),
    'DebugKit' => [ 'forceEnable' => TRUE], 
...

在此之前，我在日志文件中有此警告：

warning: DebugKit is disabling itself as your host `my.example.com` is not in the known safe list of 
   top-level-domains (localhost, invalid, test, example, local). 
   If you would like to force DebugKit on use the `DebugKit.forceEnable` Configure option.

在我设置了上面的代码之后，警告已经消失了，但是当错误发生时，我仍然看不到CakePHP调试窗口。我只看到这个：

Fatal error: Declaration of App\Controller\ErrorController::beforeRender(Cake\Event\EventInterface $event) 
  must be compatible with App\Controller\AppController::beforeRender(Cake\Event\EventInterface $event): 
  void in /var/www/vhosts/example.ocm/my.example.com/src/Controller/ErrorController.php on line 54

我还错过了什么，做错了什么？调试消息仅在日志文件中，但我希望在浏览器中也能看到它。