GraphQL\Error\Error::jsonSerialize PHP Метод

Specify data which should be serialized to JSON

С версии: 5.4.0

public jsonSerialize ( ) : mixed
Результат	mixed	data which can be serialized by json_encode, which is a value of any type other than a resource.

    function jsonSerialize()
    {
        return $this->toSerializableArray();
    }

Error