Fatal error: Uncaught Error: Call to undefined function add_action() in /export/sd202/www/jp/r/e/gmoserver/6/2/sd0518962/himuka-tour.jp/wordpress-4.9.4-ja-jetpack_webfont-undernavicontrol/wp-content/plugins/my-calendar/my-calendar-core.php:2563 Stack trace: #0 /export/sd202/www/jp/r/e/gmoserver/6/2/sd0518962/himuka-tour.jp/wordpress-4.9.4-ja-jetpack_webfont-undernavicontrol/wp-content/plugins/my-calendar/my-calendar.php(155): require() #1 /export/sd202/www/jp/r/e/gmoserver/6/2/sd0518962/himuka-tour.jp/wordpress-4.9.4-ja-jetpack_webfont-undernavicontrol/wp-settings.php(545): include_once('/export/sd202/w...') #2 /export/sd202/www/jp/r/e/gmoserver/6/2/sd0518962/himuka-tour.jp/wordpress-4.9.4-ja-jetpack_webfont-undernavicontrol/wp-config.php(84): require_once('/export/sd202/w...') #3 /export/sd202/www/jp/r/e/gmoserver/6/2/sd0518962/himuka-tour.jp/wordpress-4.9.4-ja-jetpack_webfont-undernavicontrol/wp-load.php(50): require_once('/export/sd202/w...') #4 /export/sd202/www/jp/r/e/gmoserver/6/2/sd0518962/himuka-tour.jp/wordpress-4.9.4-ja-jetpack_webfont-undernavicontrol/wp-blog-header.php(13): require_once('/export/sd202/w...') #5 /export/sd202/www/jp/r/e/gmoserver/6/2/sd0518962/himuka-tour.jp/index.php(17): require('/export/sd202/w...') #6 {main} thrown in /export/sd202/www/jp/r/e/gmoserver/6/2/sd0518962/himuka-tour.jp/wordpress-4.9.4-ja-jetpack_webfont-undernavicontrol/wp-content/plugins/my-calendar/my-calendar-core.php on line 2563