  'providers' => [
    // ...
    Egorryaroslavl\About\AboutServiceProvider::class,
    Collective\Html\HtmlServiceProvider::class,
    Barryvdh\Elfinder\ElfinderServiceProvider::class,
    // ...
  ],

and aliases

  'aliases' => [
    // ...
      'Form' => Collective\Html\FormFacade::class,
      'Html' => Collective\Html\HtmlFacade::class,
    // ...
  ],

and run

php artisan vendor:publish

And after all, run this...

php artisan migrate