Fatal error: Uncaught Error: Class "JsonSchema\Constraints\Constraint" not found in /users/quirl/www/filemanager/spark/protected/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:24 Stack trace: #0 {main} thrown in /users/quirl/www/filemanager/spark/protected/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php on line 24