For macOS users who install thrift with HomeBrew, 8th line of MyAddServer.php should be: define('THRIFT_PHP_LIB', '/usr/local/Cellar/thrift/0.9.3'); If thrift module has been installed with `pip install thrift`, 5th line of MyAddClient.py is not necessary. In 19th line of MyAddClient.py, `MyFirstService` is not defined. It should be `AddService`.