Adding to Slim Framework

[fastsol]

How do I add this into a Slim3 app. It tried this $app->add(new Middlewares\Debugbar()); but got this error: Fatal error: Uncaught RuntimeException: {} is not resolvable in D:\checkinslim\vendor\slim\slim\Slim\CallableResolver.php on line 104

[oscarotero]

Slim v3 uses an old spec of middlewares.
You can use this package: https://github.com/oscarotero/psr7-middlewares or wait for slim v4 which support psr-15 middlewares