Fatal error: Uncaught Error: Interface 'Psr\Container\ContainerInterface' not found in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/symfony/service-contracts/ServiceProviderInterface.php:22 Stack trace: #0 {main} thrown in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/symfony/service-contracts/ServiceProviderInterface.php on line 22