在laravel中获取youtube类别列表时获取错误

Question

I got this error:

Undefined property: Dawson\Youtube\Youtube::$videoCategories

This is my controller categories method

public function categories()
{
  $youtube = \App::make('youtube');

  $categories = $youtube->videoCategories->listVideoCategories('snippet', ['regionCode' => 'MA']);
  print_r($categories);
  dump($categories);
}