Can't get it working.

Hello guys,

I’m developing a website but i’m running into some problems.
I have 2 custom post types : Producten and Clients. I made a connection between those 2 in functions.php:

function my_connection_types() {
p2p_register_connection_type( array(
‘name’ => ‘client_to_products’,
‘from’ => ‘klanten’,
‘to’ => ‘producten’
) );
}
add_action( ‘p2p_init’, ‘my_connection_types’ );

Then on my template where i got post ‘klanten’ (Clients) my connection seems to work fine. But when i go to single-klanten.php
i won’t get it working:
<?php
$connected = new WP_Query( array(
‘connected_type’ => ‘client_to_products’,
‘connected_items’ => array(get_the_id()),
‘nopaging’ => true,
) );
if ( $connected->have_posts() ) :
?>

<?php while ( $connected->have_posts() ) : $connected->the_post(); ?>
• <?php the_title(); ?>

<?php endwhile; ?>

<?php else: ?>
<p>geen producten gevonden gevonden</p>
<?php
wp_reset_postdata();
endif;
wp_reset_query();
?>

The link if it helps:
http://www.icreative.nl/klanten/akzonobel/

https://wordpress.org/plugins/posts-to-posts/