[5.2.2]Build dll with UnityEngine.UI.dll show error when the first time UnityEditor was complied

View attachment 160796

i have try build with */UnityExtensions\Unity\GUISystem/UnityEngine.UI.dll
and */UnityExtensions\Unity\GUISystem\Standalone/UnityEngine.UI.dll
still error...but playing is ok.

by the way, what differ between that 2 dlls?? under */GUISystem/*