Editor/UnityEditor.UI.dll Timestamps/assets maps out of sync.

DON’T JUMP THE GUN, THIS IS not a DUPLICATE!

Unity 5.01 WIN7 - I know how to fix this: Timestamps (###) and assets (###) maps out of sync. for files in the assets hierarchy:

  • identify missing files, move them from their location to a newly created tmp folder under the same hierarchy
  • move files right back to the original correct location, Unity detects and syncs up automatically,shows all files as normal.
  • delete all ‘tmp’ folders
  • at worst (re)import all assets… but I avoid that

But HOW TO FIX THIS?: Timestamps (###) and assets (###) maps out of sync.

Asset ‘C:/Program Files/Unity501/Editor/Data/UnityExtensions/Unity/GUISystem/Editor/UnityEditor.UI.dll’ is in timestamps but is not known in guidmapper…

Asset ‘C:/Program Files/Unity501/Editor/Data/UnityExtensions/Unity/GUISystem/UnityEngine.UI.dll’ is in timestamps but is not known in guidmapper…

Use this script: http://forum.unity3d.com/threads/unityengine-ui-dll-is-in-timestamps-but-is-not-known-in-assetdatabase.274492/#post-1942214