Fatal error: Uncaught Error: Class "Core\Types\Sdk\CoreCallback" not found in /usr/www/pireborn/public/Donate/vendor/paypal/paypal-server-sdk/src/Http/HttpCallBack.php:18 Stack trace: #0 {main} thrown in /usr/www/pireborn/public/Donate/vendor/paypal/paypal-server-sdk/src/Http/HttpCallBack.php on line 18