Fatal error: Uncaught Error: Interface 'Silex\ServiceProviderInterface' not found in /var/www/html/ng-crm/yiiapp/vendor/cocur/slugify/src/Bridge/Silex/SlugifyServiceProvider.php:28 Stack trace: #0 {main} thrown in /var/www/html/ng-crm/yiiapp/vendor/cocur/slugify/src/Bridge/Silex/SlugifyServiceProvider.php on line 28