Fatal error: Uncaught Error: Interface 'Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface' not found in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/symfony/framework-bundle/CacheWarmer/AbstractPhpFileCacheWarmer.php:20 Stack trace: #0 {main} thrown in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/symfony/framework-bundle/CacheWarmer/AbstractPhpFileCacheWarmer.php on line 20