ステップ1〜4 枠の左上にナンバー付き
Fatal error: Uncaught Error: Call to undefined function wp_related_posts() in /home/fghj/code-test.info/public_html/wp-content/themes/web-template 10:15/single.php:52 Stack trace: #0 /home/fghj/code-test.info/public_html/wp-includes/template-loader.php(106): include() #1 /home/fghj/code-test.info/public_html/wp-blog-header.php(19): require_once('/home/fghj/code...') #2 /home/fghj/code-test.info/public_html/index.php(17): require('/home/fghj/code...') #3 {main} thrown in /home/fghj/code-test.info/public_html/wp-content/themes/web-template 10:15/single.php on line 52