Fatal error: Uncaught Error: Class 'ET_Core_API_Email_Provider' not found in /var/www/html/emcs/wp-content/themes/Divi/core/components/api/email/Mailster.php:13 Stack trace: #0 {main} thrown in /var/www/html/emcs/wp-content/themes/Divi/core/components/api/email/Mailster.php on line 13