〇〇するには？

Warning: Attempt to read property "post_author" on null in /home/c6381778/public_html/kazanmama-lab.com/wp-content/themes/jin/category.php on line 27

Warning: Attempt to read property "display_name" on false in /home/c6381778/public_html/kazanmama-lab.com/wp-content/themes/jin/category.php on line 28