Fatal error: Uncaught TypeError: ftp_mkdir(): Argument #1 ($ftp) must be of type FTP\Connection, null given in /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php:580 Stack trace: #0 /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php(580): ftp_mkdir(NULL, '/var/www/html/w...') #1 /var/www/html/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-cache.php(79): WP_Filesystem_FTPext->mkdir('/var/www/html/w...', 493) #2 /var/www/html/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-cache.php(52): RankMath\Sitemap\Cache->is_writable() #3 /var/www/html/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-sitemap-xml.php(80): RankMath\Sitemap\Cache->__construct() #4 /var/www/html/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-router.php(79): RankMath\Sitemap\Sitemap_XML->__construct('1') #5 /var/www/html/wp-includes/class-wp-hook.php(324): RankMath\Sitemap\Router->request_sitemap(Object(WP_Query)) #6 /var/www/html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array) #7 /var/www/html/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #8 /var/www/html/wp-includes/class-wp-query.php(1154): do_action_ref_array('parse_query', Array) #9 /var/www/html/wp-includes/class-wp-query.php(1897): WP_Query->parse_query() #10 /var/www/html/wp-includes/class-wp-query.php(3949): WP_Query->get_posts() #11 /var/www/html/wp-includes/class-wp.php(701): WP_Query->query(Array) #12 /var/www/html/wp-includes/class-wp.php(821): WP->query_posts() #13 /var/www/html/wp-includes/functions.php(1342): WP->main('') #14 /var/www/html/wp-blog-header.php(16): wp() #15 /var/www/html/index.php(17): require('/var/www/html/w...') #16 {main} thrown in /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php on line 580 Fatal error: Uncaught TypeError: ftp_nlist(): Argument #1 ($ftp) must be of type FTP\Connection, null given in /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php:438 Stack trace: #0 /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php(438): ftp_nlist(NULL, '/var/www/html/w...') #1 /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php(456): WP_Filesystem_FTPext->exists('/var/www/html/w...') #2 /var/www/html/wp-content/plugins/woocommerce/src/Internal/Admin/Logging/FileV2/File.php(254): WP_Filesystem_FTPext->is_file('/var/www/html/w...') #3 /var/www/html/wp-content/plugins/woocommerce/src/Internal/Admin/Logging/FileV2/File.php(437): Automattic\WooCommerce\Internal\Admin\Logging\FileV2\File->is_writable() #4 /var/www/html/wp-content/plugins/woocommerce/src/Internal/Admin/Logging/FileV2/FileController.php(135): Automattic\WooCommerce\Internal\Admin\Logging\FileV2\File->write('2025-09-21T20:5...') #5 /var/www/html/wp-content/plugins/woocommerce/src/Internal/Admin/Logging/LogHandlerFileV2.php(62): Automattic\WooCommerce\Internal\Admin\Logging\FileV2\FileController->write_to_file('fatal-errors', '2025-09-21T20:5...', 1758488302) #6 /var/www/html/wp-content/plugins/woocommerce/includes/class-wc-logger.php(189): Automattic\WooCommerce\Internal\Admin\Logging\LogHandlerFileV2->handle(1758488302, 'critical', 'Uncaught TypeEr...', Array) #7 /var/www/html/wp-content/plugins/woocommerce/includes/class-wc-logger.php(236): WC_Logger->log('critical', 'Uncaught TypeEr...', Array) #8 /var/www/html/wp-content/plugins/woocommerce/includes/class-woocommerce.php(438): WC_Logger->critical('Uncaught TypeEr...', Array) #9 [internal function]: WooCommerce->log_errors() #10 {main} thrown in /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php on line 438