Non-nullable property 'Value' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

This construct is deprecated. Called by the de-serializer; should only be called by deriving classes for de-serialization purposes

Non-nullable property 'Value' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.