You have ported some Crystal objects to another environment, or rebuilt some extent of your existing Crystal hierarchy.
Crystal is looking for some objects which used to be in the old hierarchy which has been recently changed. You need to copy the previous hierarchy - i.e. folders contain the same subfolders they used to, the same objects in the same folders, and whathaveyou.
Alternatively, you are logged on as another user, trying to access some files which are stored in your original accounts private folder(s). Log on again as yourself.
Naith