using UnityEngine.UI for dll Library

Unity Engine
1

Hey guys, quick question:
I want to make a dll file with some classes using UnityEngine.UI, but I can’t get it to work.
I’ve tried in Visual Studio, Visual Studio Code and Monodevelop, it’s the same everywhere,
UnityEngine works just fine but UnityEngine.UI just throws errors.

5070503--498521--UInotworking.PNG

Also I’m not sure if this is the right Subforum.
Kind regards and thanks in advance.

2

It seems that starting in Unity 2019.2, the UI component has been moved into Package Manager.

There’s an explanation in this post