Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /home/xs957429/the-room-tour.com/public_html/wp-content/plugins/rich-table-of-content/functions.php:519 Stack trace: #0 /home/xs957429/the-room-tour.com/public_html/wp-content/plugins/rich-table-of-content/functions.php(653): rtoc_get_index('<p>\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAE\xE8\xA8\x98...') #1 /home/xs957429/the-room-tour.com/public_html/wp-includes/class-wp-hook.php(324): rtoc_switch_mokuji('<p>\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAE\xE8\xA8\x98...') #2 /home/xs957429/the-room-tour.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<p>\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAE\xE8\xA8\x98...', Array) #3 /home/xs957429/the-room-tour.com/public_html/wp-includes/formatting.php(3965): apply_filters('the_content', '\n<p>\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAE\xE8\xA8...') #4 /home/xs957429/the-room-tour.com/public_html/wp-includes/class-wp-hook.php(324): wp_trim_excerpt('\n<p>\xE4\xBB\x8A\xE5\x9B\x9E\xE3\x81\xAE\xE8\xA8...', Object(WP_P in /home/xs957429/the-room-tour.com/public_html/wp-content/plugins/rich-table-of-content/functions.php on line 519