[plugin: multiple content blocks] editor doesn't work

I created a new template with the the_block(‘name’); code but the plugin always says:

There are no content blocks in this template.

Below is my template. Can someone please let me know what I am doing wrong?

<?php
/*
Template Name: custome-page
Notes:  Use this template for multiple content blocks
*/
?>

<?php get_header(); ?>

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

    <div class="post" id="post-<?php the_ID(); ?>">
        <div class="CommonTitle"><h1 class="CommonTitle"><?php the_title(); ?></h1></div>
        <div class="post-content">
			<?php the_content('<p class="serif">Read the rest of this page ?</p>'); ?>

			<div>
				<?php the_block('blockname'); ?>
			</div>
        </div>
    </div>

  <?php endwhile; endif; ?>

<?php get_footer(); ?>