Create a Form Macros in Laravel 5

Hi all, This is my first PHP Framework so i'm a noob about it, i'm sorry for that.

I decided to create my first Form Macros with this steps:

1. I create a ServiceProvider

<?php
namespace App\Providers;

use Collective\Html\HtmlServiceProvider;

class MacroServiceProvider extends HtmlServiceProvider
{
    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        // Macros must be loaded after the HTMLServiceProvider's
        // register method is called. Otherwise, csrf tokens
        // will not be generated
        parent::register();

        // Load macros
        require base_path() . '/resources/macros/people.php';
    }
}

2. i create a new file people.php with inside the new FormMacro

<?php
/**
 * This file has the People's Form Macros.
 * It means: Teachers, Students and Contacts.
 */

Form::macro('active', function () {
    $html =
        '<select id="active" class="form-control" required>
            <option value="" disabled selected>Attivo</option>
            <option value="Si">Si</option>
            <option value="No">No</option>
        </select>';

    return $html;
});

Now if i try to use my new 'active' Form Macro:

{{ Form::active() }}

i get this error:

Method active does not exist. (View: C:\xampp\htdocs\supsi-progetto\resources\views\backend\new-student.blade.php)

Honestly i don't know where is the mistake. I just follow a discussion inside of this forum and i'm pretty sure that i did all the steps correctly. Probably is missing something but i don't know what.

Thank you