Fatal error: Uncaught Error: Interface 'JsonSchema\UriRetrieverInterface' not found in /var/www/html/simplesamlphp/vendor/justinrainbow/json-schema/src/JsonSchema/Uri/UriRetriever.php:27
Stack trace:
#0 {main}
  thrown in /var/www/html/simplesamlphp/vendor/justinrainbow/json-schema/src/JsonSchema/Uri/UriRetriever.php on line 27