It seems that you have added the abstract System.Enum type. What you need to do instead is add the actual enum you want to use, like for example UnityEngine.WrapMode, not the base type System.Enum.
Same is the problem for Dictionaries, although Dictionaries are unfortunately not really supported to be used as blackboard variables through the editor at the moment.
Let me know if adding enums works for you considering the above.
Thanks.
Gavalakis
