执行api.php时:Fatalerror:Interface'Silex\ControllerProviderInterface'notfoundinC:\xampp\htdocs\lab\src\Api\UserController.phponline9Composer:{"require":{"silex/silex":"^2.0"},"autoload":{"psr-4":{"Api\\":"src/Api"}}}api.php:mount('/',newApi\UserController());$app->run();src/Api/UserController.php:g