Fatal error: Uncaught Error: Class "Opis\JsonSchema\Validator" not found in C:\xampp\htdocs\wo\woocommerce\vendor\opis\json-schema\src\CompliantValidator.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wo\woocommerce\vendor\opis\json-schema\src\CompliantValidator.php on line 20