Fatal error: Uncaught Error: Interface "CoreInterfaces\Core\Authentication\AuthInterface" not found in /home/busines5/public_html/mailer.businessbrandagency.com/vendor/apimatic/core/src/Authentication/Auth.php:17 Stack trace: #0 {main} thrown in /home/busines5/public_html/mailer.businessbrandagency.com/vendor/apimatic/core/src/Authentication/Auth.php on line 17