Load button does nothing (and JS error)

Hi,

When I click the load more button, nothing happens and I get this error on the console:

Uncaught ReferenceError: elm_button_vars is not defined frontend.min.js?ver=1.0.0:1

Here’s my code:

<div id="posts-load-more">
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<article>
<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
</article>
<?php endwhile; endif; ?>
</div>
<div><?php load_more_button(); ?></div>

Any help?
Thanks!