Fatal error: Uncaught Error: Interface 'Symfony\Component\ErrorHandler\ErrorRenderer\ErrorRendererInterface' not found in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/symfony/error-handler/ErrorRenderer/HtmlErrorRenderer.php:24 Stack trace: #0 {main} thrown in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/symfony/error-handler/ErrorRenderer/HtmlErrorRenderer.php on line 24