Unity错误——1.error CS1704: An assembly with the same name `UnityEngine.UI' has already been imported.
今天在使用Unity5.5.0时，开启昨天的Unity工程出现如下错误：1.errorCS1704:Anassemblywiththesamename`UnityEngine.UI'hasalreadybeenimported.Considerremovingoneofthereferencesorsigntheassembly2./Applications/Unity5.5navmesh/Uni