Fatal error: Uncaught Error: Interface 'Silex\ServiceProviderInterface' not found in /home/almasai/www/people/_old_site/vendor/KnpMenu/src/Knp/Menu/Silex/KnpMenuServiceProvider.php:16 Stack trace: #0 {main} thrown in /home/almasai/www/people/_old_site/vendor/KnpMenu/src/Knp/Menu/Silex/KnpMenuServiceProvider.php on line 16