Importing a simply script: Moving file failed

Got some nasty error:
The error occurs on importing a simple script.

Moving Temp/Assembly-UnityScript-Editor.dll.mdb to Library/ScriptAssemblies/Assembly-UnityScript-Editor.dll.mdb failed because the file or directory does not exist.

What i tried so far:
Restart Unity.
Restart the mac mini.
Delete Temp folder.
Delete Assembly-UnityScript-Editor.dll.mdb form Library/ScriptAssemblies/.

Nothing of thous works.

Got the same error immediately after creating a new custom inspector script. I didn’t think anything was wrong with the 10 or so lines in it but I must have had some really horrible typo somewhere in there. Unity crashed but I was able to reopen the project and have it happen once more before I deleted the script from my project folder.
That seemed to solve the issue but I hope nothing important was affected…

Hope this helps, Malzbier, future readers. I haven’t found much at all on this error, thought I should contribute