Fatal error: Uncaught Error: Class 'GraphQL\Validator\Rules\ValidationRule' not found in /home/itscm/dev.its.cm/itsrestapi/vendor/webonyx/graphql-php/src/Validator/Rules/UniqueOperationNames.php:16 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/itsrestapi/vendor/webonyx/graphql-php/src/Validator/Rules/UniqueOperationNames.php on line 16