Fatal error: Uncaught Error: Call to undefined function add_action() in /export/sd215/www/jp/r/e/gmoserver/3/9/sd0978239/hamakita-yui.com/wordpress-4.9.5-ja-jetpack_webfont-undernavicontrol/wp-content/plugins/jetpack/sync/class.jetpack-sync-module-plugins.php:23 Stack trace: #0 /export/sd215/www/jp/r/e/gmoserver/3/9/sd0978239/hamakita-yui.com/wordpress-4.9.5-ja-jetpack_webfont-undernavicontrol/wp-content/plugins/jetpack/sync/class.jetpack-sync-listener.php(42): Jetpack_Sync_Module_Plugins->init_listeners(Array) #1 /export/sd215/www/jp/r/e/gmoserver/3/9/sd0978239/hamakita-yui.com/wordpress-4.9.5-ja-jetpack_webfont-undernavicontrol/wp-content/plugins/jetpack/sync/class.jetpack-sync-listener.php(34): Jetpack_Sync_Listener->init() #2 /export/sd215/www/jp/r/e/gmoserver/3/9/sd0978239/hamakita-yui.com/wordpress-4.9.5-ja-jetpack_webfont-undernavicontrol/wp-content/plugins/jetpack/sync/class.jetpack-sync-listener.php(25): Jetpack_Sync_Listener->__construct() #3 /export/sd215/www/jp/r/e/gmoserver/3/9/sd0978239/hamakita-yui.com/word in /export/sd215/www/jp/r/e/gmoserver/3/9/sd0978239/hamakita-yui.com/wordpress-4.9.5-ja-jetpack_webfont-undernavicontrol/wp-content/plugins/jetpack/sync/class.jetpack-sync-module-plugins.php on line 23