Help please :((( warp theme

I need to place coauthors in this Yootheme Warp single.php… I did how I did with my previous theme, but it isn’t working 🙁 can anyone help me????

Thanx!

Here is the code:

<div id="system">

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

		<article class="item" data-permalink="<?php the_permalink(); ?>">

			<?php if (has_post_thumbnail()) : ?>
				<?php
				$width = get_option('thumbnail_size_w'); //get the width of the thumbnail setting
				$height = get_option('thumbnail_size_h'); //get the height of the thumbnail setting
				?>
				<?php the_post_thumbnail(array($width, $height), array('class' => 'size-auto')); ?>
			<?php endif; ?>

			<header>

				<h1 class="title"><?php the_title(); ?></h1>

				<p class="meta">
					<?php
						$date = '<time datetime="'.get_the_date('Y-m-d').'" pubdate>'.get_the_date().'</time>';
						printf(__('Written by %s on %s. Posted in %s', 'warp'), '<a href="'.get_author_posts_url(get_the_author_meta('ID')).'" title="'.get_the_author().'">'.get_the_author().'</a>', $date, get_the_category_list(', '));
					?>
				</p>

			</header>

			<div class="content clearfix"><?php the_content(''); ?></div>

			<?php the_tags('<p class="taxonomy">'.__('Tags: ', 'warp'), ', ', '</p>'); ?>

			<?php edit_post_link(__('Edit this post.', 'warp'), '<p class="edit">','</p>'); ?>

			<?php if (pings_open()) : ?>
			<p class="trackback"><?php printf(__('<a href="%s">Trackback</a> from your site.', 'warp'), get_trackback_url()); ?></p>
			<?php endif; ?>

			<?php if (get_the_author_meta('description')) : ?>
			<section class="author-box clearfix">

				<?php echo get_avatar(get_the_author_meta('user_email')); ?>

				<h3 class="name"><?php the_author(); ?></h3>

				<div class="description"><?php the_author_meta('description'); ?></div>

			</section>
			<?php endif; ?>

			<?php comments_template(); ?>

		</article>

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

</div>

https://wordpress.org/plugins/co-authors-plus/