Fatal error: Uncaught Error: Class 'Psr\Log\AbstractLogger' not found in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/symfony/error-handler/BufferingLogger.php:21 Stack trace: #0 {main} thrown in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/symfony/error-handler/BufferingLogger.php on line 21