Fatal error: Uncaught Error: Class "GraphQL\Validator\Rules\ValidationRule" not found in D:\htdocs\SuiteCRM\vendor\webonyx\graphql-php\src\Validator\Rules\SingleFieldSubscription.php:12 Stack trace: #0 {main} thrown in D:\htdocs\SuiteCRM\vendor\webonyx\graphql-php\src\Validator\Rules\SingleFieldSubscription.php on line 12