Fatal error: Uncaught Error: Class 'Braintree\Collection' not found in /home/app/htdocs/lidia/vendor/braintree/braintree_php/lib/Braintree/Error/ValidationErrorCollection.php:19 Stack trace: #0 {main} thrown in /home/app/htdocs/lidia/vendor/braintree/braintree_php/lib/Braintree/Error/ValidationErrorCollection.php on line 19