Error creating class

[scriptburn]

I am passing this
$app = new \Slim\App($settings);
$authBootstrap = new Bootstrap($app, $adapter, $acl);

and getting this error

Fatal error: Uncaught TypeError: Argument 1 passed to JeremyKendall\Slim\Auth\Bootstrap::__construct() must be an instance of Slim\Slim, instance of Slim\App given

It seems that Slim3 is not using Slim as main class name but App.