Fatal error: Uncaught Error: Interface "WPMailSMTP\Providers\AuthInterface" not found in /var/www/html/wp-content/plugins/wp-mail-smtp-pro/src/Providers/AuthAbstract.php:13 Stack trace: #0 {main} thrown in /var/www/html/wp-content/plugins/wp-mail-smtp-pro/src/Providers/AuthAbstract.php on line 13