Fatal error: Uncaught Error: Call to undefined function the_thumbnail() in /home/ukk-uchida/www/wp/wp-content/themes/base_them/index.php:19 Stack trace: #0 /home/ukk-uchida/www/wp/wp-includes/template-loader.php(106): include() #1 /home/ukk-uchida/www/wp/wp-blog-header.php(19): require_once('/home/ukk-uchid...') #2 /home/ukk-uchida/www/index.php(17): require('/home/ukk-uchid...') #3 {main} thrown in /home/ukk-uchida/www/wp/wp-content/themes/base_them/index.php on line 19