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('<p>\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAF<st...') #1 /home/adventure88/gundamwalker.com/public_html/wp-includes/class-wp-hook.php(308): rtoc_switch_mokuji('<p>\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAF<st...') #2 /home/adventure88/gundamwalker.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<p>\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAF<st...', Array) #3 /home/adventure88/gundamwalker.com/public_html/wp-includes/formatting.php(3928): apply_filters('the_content', '\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAF<stron...') #4 /home/adventure88/gundamwalker.com/public_html/wp-includes/class-wp-hook.php(308): wp_trim_excerpt('\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAF<stron...', Object(WP_Post)) #5 /home/adventure88/g in /home/adventure88/gundamwalker.com/public_html/wp-content/plugins/rich-table-of-content/functions.php on line 519