Fatal error: Interface 'Silex\ServiceProviderInterface' not found in /var/www/html/dev/spa/vendor/filp/whoops/src/Whoops/Provider/Silex/WhoopsServiceProvider.php on line 15

Call Stack:
    0.0007     248224   1. {main}() /var/www/html/dev/spa/vendor/filp/whoops/src/Whoops/Provider/Silex/WhoopsServiceProvider.php:0