Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /home/veruscopy/tanilog.jp/public_html/wp-content/plugins/rich-table-of-content/functions.php:519 Stack trace: #0 /home/veruscopy/tanilog.jp/public_html/wp-content/plugins/rich-table-of-content/functions.php(1380): rtoc_get_index('<p>\xE3\x81\x9F\xE3\x81\xAB\xE3\x83\xBC\xE3\x81\xA7...') #1 /home/veruscopy/tanilog.jp/public_html/wp-includes/class-wp-hook.php(324): rtoc_switch_mokuji('<p>\xE3\x81\x9F\xE3\x81\xAB\xE3\x83\xBC\xE3\x81\xA7...') #2 /home/veruscopy/tanilog.jp/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<p>\xE3\x81\x9F\xE3\x81\xAB\xE3\x83\xBC\xE3\x81\xA7...', Array) #3 /home/veruscopy/tanilog.jp/public_html/wp-includes/formatting.php(3965): apply_filters('the_content', '<p>\xE3\x81\x9F\xE3\x81\xAB\xE3\x83\xBC\xE3\x81\xA7...') #4 /home/veruscopy/tanilog.jp/public_html/wp-includes/class-wp-hook.php(324): wp_trim_excerpt('<p>\xE3\x81\x9F\xE3\x81\xAB\xE3\x83\xBC\xE3\x81\xA7...', Object(WP_Post)) #5 /home/veruscopy/tanilo in /home/veruscopy/tanilog.jp/public_html/wp-content/plugins/rich-table-of-content/functions.php on line 519