Widgets won't save

I have almost no experience in creating widget area's and I am stuck at saving the widgets in the widget area 'red menu'. I have searched a dozen posts but I can't seem to get it working.

I am currently working in Wordpress 4.0.1 and this is the code I have:

Widgets.php:

class Red_Menu_Widget extends WP_Widget {
    function redmenu_widget( $args, $instance ) {
         $widget_ops = array(
         'classname' => 'redmenu_widget',
         'description' => __('Description in here')
         $control_ops = array( 'width' => 300, 'height' => 350, 'id_base' => 'redmenu_widget' );  

        $this->WP_Widget( 'redmenu_widget', __('Rood menu rechts', 'redmenu_widget'), $widget_ops, $control_ops );  
         );
        //parent::WP_Widget(false, 'Rood menu (rechts)', $widget_ops );
    }
    function widget() { 
        $title = 'Rood menu (rechts)';

        echo $before_widget;  
        echo $title;         
        echo '<p>This is my widget output</p>';
        echo $after_widget;  
    }
}
add_action( 'widgets_init', 'prefix_register_widgets' );
function prefix_register_widgets() {
    register_widget( 'redmenu_widget' );
}

Functions.php:

function pfp_widgets_init() {

  register_sidebar( array (
  'name' => __( 'Rood menu (rechts)', 'powerforpaws' ),
  'id' => 'redmenu_widget',
  'description'   => __( 'Descriptionhere', 'powerforpaws' ),
  'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
  'after_widget' => "</li>",
  'before_title' => '<h3 class="widget-title">',
  'after_title' => '</h3>',
  ) );
} // end pfp_widgets_init

add_action( 'widgets_init', 'pfp_widgets_init' );

// Pre-set Widgets
$preset_widgets = array (
        'redmenu_widget'  => array( 'search', 'pages', 'categories', 'archives' )
);

if ( !isset( $_GET['activated'] ) ) {
        update_option( 'sidebars_widgets', $preset_widgets );
}

Sidebar.php:

<aside id="widgets"> 
    <?php if ( !function_exists('redmenu_widget') || !dynamic_sidebar('redmenu_widget') ) : ?>
        <div id="primary" class="widget-area">
            <ul class="xoxo">
                <?php dynamic_sidebar('redmenu_widget'); ?>
            </ul>
        </div><!-- #primary .widget-area -->
        <?php endif; ?>   
</aside>

What am I doing wrong?

Thanks in advance!