Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /home/adventure88/gundamwalker.com/public_html/wp-content/plugins/rich-table-of-content/functions.php:519 Stack trace: #0 /home/adventure88/gundamwalker.com/public_html/wp-content/plugins/rich-table-of-content/functions.php(1380): rtoc_get_index('<h1>\xE3\x83\x9E\xE3\x82\xB8\xE3\x83\xB3\xE3\x82...') #1 /home/adventure88/gundamwalker.com/public_html/wp-includes/class-wp-hook.php(308): rtoc_switch_mokuji('<h1>\xE3\x83\x9E\xE3\x82\xB8\xE3\x83\xB3\xE3\x82...') #2 /home/adventure88/gundamwalker.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<h1>\xE3\x83\x9E\xE3\x82\xB8\xE3\x83\xB3\xE3\x82...', Array) #3 /home/adventure88/gundamwalker.com/public_html/wp-includes/formatting.php(3928): apply_filters('the_content', '<h1>\xE3\x83\x9E\xE3\x82\xB8\xE3\x83\xB3\xE3\x82...') #4 /home/adventure88/gundamwalker.com/public_html/wp-includes/class-wp-hook.php(308): wp_trim_excerpt('<h1>\xE3\x83\x9E\xE3\x82\xB8\xE3\x83\xB3\xE3\x82...', Object(WP in /home/adventure88/gundamwalker.com/public_html/wp-content/plugins/rich-table-of-content/functions.php on line 519