Fatal error: Uncaught Error: Interface "Mailgun\Model\ApiResponse" not found in /home/backend/public_html/fm360/system/vendor/mailgun/mailgun-php/src/Model/Mailboxes/CreateResponse.php:16 Stack trace: #0 {main} thrown in /home/backend/public_html/fm360/system/vendor/mailgun/mailgun-php/src/Model/Mailboxes/CreateResponse.php on line 16