I've googled this, searched the Unity forum and so on but can't find a good answer.
Created an editor wizard script today that uses System.Xml.Linq. Now Unity says this assembly reference can not be found.
I've read about people using it, old forum posts says this is not possible since Unity uses an old version of .NET but those posts where from 2 years ago.
Is it possible to get it working? How can I add an assembly reference from the Unity editor, I have tried using a visual studio project, adding it there and so on but Unity doesn't pick this up.
Same error in both Unity free and pro...