Shortcodes not displaying in custom theme single.php

Hi, I’m trying to use FB comments in my theme but I still can’t display it – it rests as “[fbcomments]”. Could you give me a hint, please?

single.php

<div class="col-md-6 column content" id="post_container">
   <?php if ( have_posts() ) : while ( have_posts() ) : the_post();  ?>
   	<div class="post">
         <h2><?php the_title(); ?></h2>
         <?php dynamic_sidebar( 'banner-top' ); ?>
         <?php the_post_thumbnail(); ?>
         <div class="article"><?php the_content(); ?></div>
         <?php dynamic_sidebar( 'banner-bottom' ); ?>
         <div class="row margin-no">
           <div id="my-sharethis" class="fleft"><?php do_action( 'custom_sharethis_widget' ); ?></div>
           <div class="comments-count fright">
             	<?php comments_number(__( '<b class="num">0</b><br />komentářů', 'Zvratenyhumor'), __('<b="num">1</b><br />komentář', 'Zvratenyhumor'), __('<b="num">%</b><br />komentářů', 'Zvratenyhumor')); ?></div>
      	</div>
         <div class="navigation">
            <?php previous_post_link('%link', '<nav id="nav-prev" class="fleft"></nav>'); ?>
            <?php next_post_link('%link', '<nav id="nav-next" class="fright"></nav>'); ?>
         </div>
      </div>
      <?php dynamic_sidebar( 'fb' ); ?>
      <?php //comments_template();
      echo do_shortcode('[fbcomments]');
      ?>
   <?php endwhile; else : ?>
   	<p><?php _e( 'Sorry, no posts matched your criteria.' ); ?></p>
   <?php endif; ?>
</div>

https://ww.wp.xz.cn/plugins/facebook-comments-plugin/