Fatal error: Uncaught Error: Class 'PayPalCheckoutSdk\Core\PayPalEnvironment' not found in /home/bucereo/my_project_name/vendor/Checkout-PHP-SDK-develop/lib/PayPalCheckoutSdk/Core/SandboxEnvironment.php:5 Stack trace: #0 {main} thrown in /home/bucereo/my_project_name/vendor/Checkout-PHP-SDK-develop/lib/PayPalCheckoutSdk/Core/SandboxEnvironment.php on line 5