how to add rel selector to wp featured image for lightbox?

I have a custom page template like this, which opens some post thumbnails in a grid, which I’ve linked them by link tag to the image url. I also use Responsive Lightbox plugin by dFactory so there’s an option to check as: Enable for wordpress link images. Plugin needs the images to have rel=”lightbox” which i used in my html tag, but it does not work. what’s wrong with my code?

Drawings

‘painting_category’,
‘title_li’ => ”,
);
$cats = wp_list_categories( $args );
?>

<?php
$args=array(
‘post_type’ => ‘drawing’,
);
$the_query = new WP_Query($args);
?>

<?php if ($the_query->have_posts() ): while ($the_query->have_posts() ):$the_query->the_post(); ?>

<div class=”painting col-md-3 col-sm-6″ >

<a rel=”lightbox” class=”lightbox” href=”<?php the_post_thumbnail_url( ‘full’); ?>” >

<div class=”painting-image” >

<?php the_post_thumbnail(‘drawing-thumbnail’); ?>

<span class=”overlay”></span>
</div>
</a>
</div>

<?php endwhile; ?>
<?php endif; ?>

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