Fatal error: Uncaught Error: Call to undefined function wp_head() in /home/recruit2023/recruit2023.xsrv.jp/public_html/wp-content/themes/gp_saiyo_theme/index.php:16 Stack trace: #0 {main} thrown in /home/recruit2023/recruit2023.xsrv.jp/public_html/wp-content/themes/gp_saiyo_theme/index.php on line 16