Fatal error: Uncaught RuntimeException: A middleware must be an object/class name referencing an implementation of MiddlewareInterface or a callable with a matching signature. in /var/www/html/vendor/slim/slim/Slim/MiddlewareDispatcher.php:100
Stack trace:
#0 /var/www/html/vendor/slim/slim/Slim/Routing/Route.php(277): Slim\MiddlewareDispatcher->add(NULL)
#1 /var/www/html/_includes/eventi.php(29): Slim\Routing\Route->add(NULL)
#2 /var/www/html/vendor/slim/slim/Slim/Routing/RouteGroup.php(67): {closure:/var/www/html/_includes/eventi.php:16}(Object(Slim\Routing\RouteCollectorProxy))
#3 /var/www/html/vendor/slim/slim/Slim/Routing/RouteCollector.php(236): Slim\Routing\RouteGroup->collectRoutes()
#4 /var/www/html/vendor/slim/slim/Slim/Routing/RouteCollectorProxy.php(179): Slim\Routing\RouteCollector->group('/eventi', Object(Closure))
#5 /var/www/html/_includes/eventi.php(16): Slim\Routing\RouteCollectorProxy->group('/eventi', Object(Closure))
#6 /var/www/html/index.php(82): require_once('/var/www/html/_...')
#7 {main}
thrown in /var/www/html/vendor/slim/slim/Slim/MiddlewareDispatcher.php on line 100