Fatal error: Uncaught Error: Class 'WP_Filesystem_Base' not found in /home/.sites/site18/wwwroot/web/wp-admin/includes/class-wp-filesystem-ssh2.php:36 Stack trace: #0 {main} thrown in /home/.sites/site18/wwwroot/web/wp-admin/includes/class-wp-filesystem-ssh2.php on line 36