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>\n<p>\xE3\x81\x9D\xE3\x81\x93\xE3...') #1 /home/xs957429/the-room-tour.com/public_html/wp-includes/class-wp-hook.php(324): rtoc_switch_mokuji('</p>\n<p>\xE3\x81\x9D\xE3\x81\x93\xE3...') #2 /home/xs957429/the-room-tour.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('</p>\n<p>\xE3\x81\x9D\xE3\x81\x93\xE3...', Array) #3 /home/xs957429/the-room-tour.com/public_html/wp-includes/formatting.php(3965): apply_filters('the_content', '\n<p></p>\n\n\n\n\n\n\n...') #4 /home/xs957429/the-room-tour.com/public_html/wp-includes/class-wp-hook.php(324): wp_trim_excerpt('\n<p></p>\n\n\n\n\n\n\n...', Object(WP_Post)) #5 /home/xs957429/the-room-tour.com/public_html/wp-includes/plugin.php(205): WP_Hook->ap in /home/xs957429/the-room-tour.com/public_html/wp-content/plugins/rich-table-of-content/functions.php on line 519