Fatal error: Uncaught Error: Undefined constant "RankMath\Sitemap\FS_CHMOD_FILE" in /var/www/inbooster/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-cache.php:135 Stack trace: #0 /var/www/inbooster/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-sitemap-xml.php(155): RankMath\Sitemap\Cache->store_sitemap('1', 1, '<?xml version="...') #1 /var/www/inbooster/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-sitemap-xml.php(92): RankMath\Sitemap\Sitemap_XML->has_sitemap_in_cache() #2 /var/www/inbooster/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-sitemap-xml.php(82): RankMath\Sitemap\Sitemap_XML->output() #3 /var/www/inbooster/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-router.php(79): RankMath\Sitemap\Sitemap_XML->__construct('1') #4 /var/www/inbooster/wp-includes/class-wp-hook.php(324): RankMath\Sitemap\Router->request_sitemap(Object(WP_Query)) #5 /var/www/inbooster/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array) #6 /var/www/inbooster/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #7 /var/www/inbooster/wp-includes/class-wp-query.php(1140): do_action_ref_array('parse_query', Array) #8 /var/www/inbooster/wp-includes/class-wp-query.php(1868): WP_Query->parse_query() #9 /var/www/inbooster/wp-includes/class-wp-query.php(3852): WP_Query->get_posts() #10 /var/www/inbooster/wp-includes/class-wp.php(696): WP_Query->query(Array) #11 /var/www/inbooster/wp-includes/class-wp.php(816): WP->query_posts() #12 /var/www/inbooster/wp-includes/functions.php(1336): WP->main('') #13 /var/www/inbooster/wp-blog-header.php(16): wp() #14 /var/www/inbooster/index.php(17): require('/var/www/inboos...') #15 {main} thrown in /var/www/inbooster/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-cache.php on line 135