No Product Description

Hi,
the plugin use the product short description. Have you set this?
Instead if you want to use the full description add this code on your functions.php

remove_action( 'yith_wcqv_product_summary', 'woocommerce_template_single_excerpt', 20 );
add_action( 'yith_wcqv_product_summary', 'woocommerce_template_single_full_desc', 20 );
function woocommerce_template_single_full_desc(){
	global $post;

	ob_start();
	?>

	<div itemprop="description">
		<?php the_content(); ?>
	</div>

	<?php
	echo ob_get_clean();
}

Let me know.
regards