Fatal error: Uncaught Error: Class 'WP_Sitemaps_Provider' not found in /home/refref/public_html/sitemaps-20250412191601/providers/class-wp-sitemaps-users.php:17 Stack trace: #0 {main} thrown in /home/refref/public_html/sitemaps-20250412191601/providers/class-wp-sitemaps-users.php on line 17