Fatal error: Uncaught Error: Interface 'SimpleSAML\IdP\LogoutHandlerInterface' not found in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/lib/SimpleSAML/IdP/TraditionalLogoutHandler.php:19 Stack trace: #0 {main} thrown in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/lib/SimpleSAML/IdP/TraditionalLogoutHandler.php on line 19