Fatal error: Uncaught Error: Class "Braintree\Exception" not found in C:\xampp\htdocs\public\vendor\braintree\braintree_php\lib\Braintree\Exception\TestOperationPerformedInProduction.php:10 Stack trace: #0 {main} thrown in C:\xampp\htdocs\public\vendor\braintree\braintree_php\lib\Braintree\Exception\TestOperationPerformedInProduction.php on line 10