Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /home/ogitomugi/www/ogitomugijp/wproot/wp-content/plugins/woocommerce-for-japan/woocommerce-for-japan.php:178 Stack trace: #0 /home/ogitomugi/www/ogitomugijp/wproot/wp-content/plugins/woocommerce-for-japan/woocommerce-for-japan.php(110): JP4WC->includes() #1 /home/ogitomugi/www/ogitomugijp/wproot/wp-includes/class-wp-hook.php(308): JP4WC->on_plugins_loaded('') #2 /home/ogitomugi/www/ogitomugijp/wproot/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(Object(WPMailSMTP\ConnectionsManager), Array) #3 /home/ogitomugi/www/ogitomugijp/wproot/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #4 /home/ogitomugi/www/ogitomugijp/wproot/wp-settings.php(486): do_action('plugins_loaded') #5 /home/ogitomugi/www/ogitomugijp/wproot/wp-config.php(71): require_once('/home/ogitomugi...') #6 /home/ogitomugi/www/ogitomugijp/wproot/wp-load.php(50): require_once('/home/ogitomugi...') #7 /home/ogitomugi/www/ogitomugijp/wproot/wp-blog-header.php(13): requ in /home/ogitomugi/www/ogitomugijp/wproot/wp-content/plugins/woocommerce-for-japan/woocommerce-for-japan.php on line 178