Fatal error: Uncaught Error: Class 'Postmark\Models\CaseInsensitiveArray' not found in /home/app/htdocs/lidia/vendor/wildbit/postmark-php/src/Postmark/Models/DynamicResponseModel.php:24 Stack trace: #0 {main} thrown in /home/app/htdocs/lidia/vendor/wildbit/postmark-php/src/Postmark/Models/DynamicResponseModel.php on line 24