케이보드 잘쓰고있습니다.

현재 twentysixteen테마에서 통합검색할떄 리스트 썸네일이 출력 되도록 하고싶은데

https://www.cosmosfarm.com/threads/document/26741

여길 참고해서 코드를 붙여넣고 안되서 

https://github.com/cosmosfarm/KBoard-wordpress-plugin/blob/master/plugins/kboard/class/KBContent.class.php

여기 소스를 아예 갖다 붙여넣었는데도 안되네요
글 수정해서 썸네일을 다시 로드해도 안되고

<?php twentysixteen_post_thumbnail(); ?>
<?php get_the_post_thumbnail(); ?>

이렇게 두가지로 썸네일 출력을 해도 안되는데

다른 출력함수를 써야하는건가요?

<?php
/**
 * The template part for displaying results in search pages
 *
 * @package WordPress
 * @subpackage Twenty_Sixteen
 * @since Twenty Sixteen 1.0
 */

?>

<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
	<header class="entry-header">
		<?php the_title( sprintf( '<h2 class="entry-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h2>' ); ?>
	</header><!-- .entry-header -->

	<div><?php twentysixteen_post_thumbnail(); ?></div>
	<div><?php get_the_post_thumbnail(); ?></div>

	<?php if ( 'post' === get_post_type() ) : ?>
	

		<footer class="entry-footer">
			<?php twentysixteen_entry_meta(); ?>
			<?php
				edit_post_link(
					sprintf(
						/* translators: %s: Name of current post */
						__( 'Edit<span class="screen-reader-text"> "%s"</span>', 'twentysixteen' ),
						get_the_title()
					),
					'<span class="edit-link">',
					'</span>'
				);
			?>
		</footer><!-- .entry-footer -->

	<?php else : ?>

		<?php
			edit_post_link(
				sprintf(
					/* translators: %s: Name of current post */
					__( 'Edit<span class="screen-reader-text"> "%s"</span>', 'twentysixteen' ),
					get_the_title()
				),
				'<footer class="entry-footer"><span class="edit-link">',
				'</span></footer><!-- .entry-footer -->'
			);
		?>

	<?php endif; ?>
</article><!-- #post-## -->

contact-search.php 전문입니다.

<section id="primary" class="content-area">
		<main id="main" class="site-main" role="main">

		<?php if ( have_posts() ) : ?>

			<header class="page-header">
				<h1 class="page-title"><?php printf( __( 'Search Results for: %s', 'twentysixteen' ), '<span>' . esc_html( get_search_query() ) . '</span>' ); ?></h1>
			</header><!-- .page-header -->

			<?php
			// Start the loop.
			while ( have_posts() ) : the_post();

				/**
				 * Run the loop for the search to   output the results.
				 * If you want to overload this in a child theme then include a file
				 * called content-search.php and that will be used instead.
				 */
				twentysixteen_post_thumbnail(); 
				get_the_post_thumbnail(); 
				get_template_part( 'template-parts/content', 'search' );
				
			// End the loop.
			endwhile;

			// Previous/next page navigation.
			the_posts_pagination( array(
				'prev_text'          => __( 'Previous page', 'twentysixteen' ),
				'next_text'          => __( 'Next page', 'twentysixteen' ),
				'before_page_number' => '<span class="meta-nav screen-reader-text">' . __( 'Page', 'twentysixteen' ) . ' </span>',
			) );

		// If no content, include the "No posts found" template.
		else :
			get_template_part( 'template-parts/content', 'none' );

		endif;
		?>

		</main><!-- .site-main -->
	</section><!-- .content-area -->

search.php 입니다.

답변 부탁드겠습니다.