特Pでトラブル発生！【体験談】予防のためにオーナーが絶対すべき4つのこと

Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /home/kluoz/mochihuku.com/public_html/wp-content/plugins/rich-table-of-content/functions.php:519 Stack trace: #0 /home/kluoz/mochihuku.com/public_html/wp-content/plugins/rich-table-of-content/functions.php(653): rtoc_get_index('<p style="text-...') #1 /home/kluoz/mochihuku.com/public_html/wp-includes/class-wp-hook.php(310): rtoc_switch_mokuji('<p style="text-...') #2 /home/kluoz/mochihuku.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<p style="text-...', Array) #3 /home/kluoz/mochihuku.com/public_html/wp-includes/post-template.php(256): apply_filters('the_content', '<p style="text-...') #4 /home/kluoz/mochihuku.com/public_html/wp-content/themes/jin/single.php(117): the_content() #5 /home/kluoz/mochihuku.com/public_html/wp-includes/template-loader.php(106): include('/home/kluoz/moc...') #6 /home/kluoz/mochihuku.com/public_html/wp-blog-header.php(19): require_once('/home/kluoz/moc...') #7 /home/kluoz/mochihuku.com/public_htm in /home/kluoz/mochihuku.com/public_html/wp-content/plugins/rich-table-of-content/functions.php on line 519