Fatal error: Uncaught Error: Class "JsonSchema\Uri\Retrievers\AbstractRetriever" not found in C:\xampp\htdocs\snipe-it\vendor\justinrainbow\json-schema\src\JsonSchema\Uri\Retrievers\Curl.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\snipe-it\vendor\justinrainbow\json-schema\src\JsonSchema\Uri\Retrievers\Curl.php on line 20