code: protected function createCtrl(): AbstractCtrl
      {
          $componentsRootMap = AppHelper::getInstance()
              ->getConfig('componentsRootMap');
          if (!isset($componentsRootMap['controllers'])) {
              throw new Exception("The field 'componentsRootMap.controllers' must be "
              ."presented in the main configuration file.");
          }
          $ctrlNamespace = str_replace(
              \DIRECTORY_SEPARATOR,
              '\\',
              $componentsRootMap['controllers']
          );
          $ctrlFullName  = $ctrlNamespace.'\\'.$this->ctrlName;
          return new $ctrlFullName();
      }
docs: {@inheritdoc}