Custom widget does not appear

Hi!

I want to create a series of widgets and am following your tutorial Creating a widget.
AFAIK I’ve done each step correctly but the widget does not appear on Plugins > SiteOrigin Widgets. What am I doing wrong?

– I’ve checked the content of $folders after I specify the location of my widgets folder, and the path is correct.

Here is the folder structure

Here is my Widgets code. Can you tell me what I am doing wrong?
Thank you!!

<?php
/*
Widget Name: customer Vignette
 */

class Customer_Vignette_Widget extends SiteOrigin_Widget {

	function get_template_name($instance) {
		return 'customer-vignette-template';
	}

	function get_style_name($instance) {
		return '';
	}


	function __construct() {
		//Here you can do any preparation required before calling the parent constructor, such as including additional files or initializing variables.

		//Call the parent constructor with the required arguments.
		parent::__construct(
			// The unique id for your widget.
			'customer-vignette-widget',

			// The name of the widget for display purposes.
			'customer Vignette Widget',

			// The $widget_options array, which is passed through to WP_Widget.
			// It has a couple of extras like the optional help URL, which should link to your sites help or support page.
			array(
				'description' => 'Ajouter un lien de type "vignette" vers un article et configurez son affichage.',
				'help'        => 'http://example.com/hello-world-widget-docs',
			),

			//The $control_options array, which is passed through to WP_Widget
			array(
			),

			//The $form_options array, which describes the form fields used to configure SiteOrigin widgets. We'll explain these in more detail later.
			array(
				'text' => array(
					'type' => 'text',
					'label' => 'Hello world! goes here.',
					'default' => 'Hello world!'
				),
			),

			//The $base_folder path string.
			plugin_dir_path(__FILE__)
		);
	}
}

siteorigin_widget_register('customer-vignette-widget', __FILE__, 'Customer_Vignette_Widget');