Fatal error: Uncaught Error: Class 'JsonSchema\Constraints\Constraint' not found in /data/htmlwww/common/jpgraph/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/SchemaConstraint.php:24
Stack trace:
#0 {main}
thrown in /data/htmlwww/common/jpgraph/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/SchemaConstraint.php on line 24