Fatal error: Uncaught Error: Class "WPMailSMTP\Providers\OptionsAbstract" not found in /var/www/html/wp-content/plugins/wp-mail-smtp-pro/src/Providers/Gmail/Options.php:15 Stack trace: #0 {main} thrown in /var/www/html/wp-content/plugins/wp-mail-smtp-pro/src/Providers/Gmail/Options.php on line 15