`UnityEngine.UI' has already been imported....

Unity Engine
1

`UnityEngine.UI’ has already been imported. Consider removing one of the references or sign the assembly
C:/Program Files/Unity/2017/Editor/Data/UnityExtensions/Unity/GUISystem/UnityEngine.UI.dll

What is the fix for this? I’m getting it in projects updated from 5.x to 2017. I know that isn’t officially supported, but i’m trying to go in and see how I had come code set up. I fixed it in a previous upgraded project by uninstalling (deleting actually because it wasn’t in the installed programs) the 5.x install. But I cant very well delete the dll from the 2017 install directory. Thanks.

2

Maybe you could export your work as “Export Package” then import it into new Unity 2017.
Then you can excude old stuff, its trial and error.

good luck