laravel自定义视图目录服务提供程序

为什么会出现此错误：未找到查看[索引]。

我使用自定义视图目录

控制器

public function index()
    {
        return view('categories::index');
    }

class CategoryServiceProvider extends ServiceProvider {

    public function boot()
    {
        $this->loadViewsFrom(__DIR__.'../Views', 'categories');
    }
    public function register()
    {
        $this->app->bind(CategoryRepositoryInterface::class, CategoryRepository::class);
    }
}

服务提供商

public function index()
    {
        return view('categories::index');
    }

class CategoryServiceProvider extends ServiceProvider {

    public function boot()
    {
        $this->loadViewsFrom(__DIR__.'../Views', 'categories');
    }
    public function register()
    {
        $this->app->bind(CategoryRepositoryInterface::class, CategoryRepository::class);
    }
}

不是吗

public function index()
{
    return view('categories.index');
}

不是吗

public function index()
{
    return view('categories.index');
}