Fatal error: Uncaught Error: Interface 'SimpleSAML\IdP\LogoutHandlerInterface' not found in /var/www/html/simplesamlphp/src/SimpleSAML/IdP/TraditionalLogoutHandler.php:20
Stack trace:
#0 {main}
  thrown in /var/www/html/simplesamlphp/src/SimpleSAML/IdP/TraditionalLogoutHandler.php on line 20