Fatal error: Uncaught Error: Class 'Braintree\Base' not found in /opt/bitnami/apache/htdocs/taxi_app/WebServices/braintree/lib/Braintree/AmexExpressCheckoutCard.php:31 Stack trace: #0 {main} thrown in /opt/bitnami/apache/htdocs/taxi_app/WebServices/braintree/lib/Braintree/AmexExpressCheckoutCard.php on line 31