Building error after 4.3 update

Can’t build my project after 4.3 update. Console spams 999+ times:

"An asset is marked as dont save, but is included in the build:
UnityEditor.HostView:OnGUI()
"

And

"Building - Failed to write file: sharedassets1.assets
UnityEditor.HostView:OnGUI()"

Any ideas?

I figured out that one of prefabs in the ‘Resources’ folder was the reason of the error.

My problem was that for some reason one of the prefabs had hideFlags switched.
I compared it in a merge tool with other prefabs and found these lines:

  m_ObjectHideFlags: 13```

And all the other prefabs had **1** as ```m_ObjectHideFlags``` value.
Hope this will help someone.

I had the same problem. Somehow m_ObjectHideFlags: 13 ended up in the prefab. Changed it to 1 and everything worked again.

I just moved the keystore file out of the project folder and it fixed the issue. I don’t know how they possibly related to each other, but it did the job!