Fatal error: Uncaught Error: Interface 'Symfony\Contracts\Service\ServiceSubscriberInterface' not found in /var/www/alldocs/home/cmckay/cms_static/simplesamlphp_sp/vendor/symfony/framework-bundle/DependencyInjection/CompatibilityServiceSubscriberInterface.php:28 Stack trace: #0 {main} thrown in /var/www/alldocs/home/cmckay/cms_static/simplesamlphp_sp/vendor/symfony/framework-bundle/DependencyInjection/CompatibilityServiceSubscriberInterface.php on line 28