東川町移住で失敗しないために知るべきこと。1か月体験移住してわかった！

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>\xE7\xA7\x81\xE3\x81\xAF\xE3\x80\x81\xE6\x9D\xB1...') #1 /home/kluoz/mochihuku.com/public_html/wp-includes/class-wp-hook.php(310): rtoc_switch_mokuji('<p>\xE7\xA7\x81\xE3\x81\xAF\xE3\x80\x81\xE6\x9D\xB1...') #2 /home/kluoz/mochihuku.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<p>\xE7\xA7\x81\xE3\x81\xAF\xE3\x80\x81\xE6\x9D\xB1...', Array) #3 /home/kluoz/mochihuku.com/public_html/wp-includes/post-template.php(256): apply_filters('the_content', '\xE7\xA7\x81\xE3\x81\xAF\xE3\x80\x81\xE6\x9D\xB1\xE5\xB7\x9D...') #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/k in /home/kluoz/mochihuku.com/public_html/wp-content/plugins/rich-table-of-content/functions.php on line 519