Fatal error: Uncaught Error: Interface 'JsonSchema\Constraints\ConstraintInterface' not found in /var/www/html/simplesamlphp/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Drafts/Draft06/RefConstraint.php:11
Stack trace:
#0 {main}
  thrown in /var/www/html/simplesamlphp/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Drafts/Draft06/RefConstraint.php on line 11