Laravel 5: Form Class not found

As I use Laravel 5, I followed this post and Laravel Collective, which ended up in the following error.

FatalErrorException in ProviderRepository.php line 146: Class 'Illuminate\Html\HtmlServiceProvider\HtmlServiceProvider' not found

It seems to me that the line, Collective\Html\HtmlServiceProvider::class, is causing this error. However, without this line, there will be the following error.

ErrorException in AliasLoader.php line 66: Class 'Collective\Html\FormFacade' not found (View: C:\wamp\www\Hiroki.com\resources\views\edit_pages\post_article.blade.php)

I think this message indicates that I must not delete it. So, I suspect that there would be something I need to install.

However, as the Laravel Collective indicates, I did the composer require illuminate/html command too.

Do you see anything I need to do so that the Forms & HTML classes would be available?

Any suggestion will be appreciated!

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