Hello Calmat,
That error indicates that the drive you selected to save your File History to is currently not available (aka: drive letter changed, not connected, or not turned on).
Check using step 3 in OPTION THREE of the tutorial below to see what drive letter you have selected for your File History, then investigate to see what's wrong or has changed with that drive or partition.
http://www.eightforums.com/tutorials/2484-file-history-how-use-windows-8-a.html
Hope this helps for now,
Shawn