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Fatal error: Uncaught Error: Call to a member function add_rewrite_tag() on null in /nas/content/live/encounterbooks/wp-includes/rewrite.php:172 Stack trace: #0 /nas/content/live/encounterbooks/wp-includes/class-wp-taxonomy.php(379): add_rewrite_tag('%gn-genre%', '([^/]+)', 'gn-genre=') #1 /nas/content/live/encounterbooks/wp-includes/taxonomy.php(386): WP_Taxonomy->add_rewrite_rules() #2 /nas/content/live/encounterbooks/wp-content/plugins/xml-sitemap-feed/upgrade.php(98): register_taxonomy('gn-genre', NULL) #3 /nas/content/live/encounterbooks/wp-content/plugins/xml-sitemap-feed/upgrade.php(13): xmlsf_upgrade('4.7.5') #4 /nas/content/live/encounterbooks/wp-content/plugins/xml-sitemap-feed/inc/class-xmlsitemapfeed.php(147): require_once('/nas/content/li...') #5 /nas/content/live/encounterbooks/wp-content/plugins/xml-sitemap-feed/xml-sitemap.php(85): XMLSF\XMLSitemapFeed->__construct() #6 /nas/content/live/encounterbooks/wp-includes/class-wp-hook.php(286): xmlsf('') #7 /nas/content/live/encounterbooks/wp-includes/class-wp-ho in /nas/content/live/encounterbooks/wp-includes/rewrite.php on line 172