Fatal error: Uncaught Error: Interface 'JsonSchema\Uri\Retrievers\UriRetrieverInterface' not found in /data/htmlwww/common/jpgraph/vendor/justinrainbow/json-schema/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php:16
Stack trace:
#0 {main}
thrown in /data/htmlwww/common/jpgraph/vendor/justinrainbow/json-schema/src/JsonSchema/Uri/Retrievers/AbstractRetriever.php on line 16