phantom search folder

Hello,

once upon a time I made a search and tried to save it like that "/Courses/a-
course-name-i-forgot"
now there an error I think and I realized that sub-folders for searches are 
impossible.
and ever since that day every time I start kmail there is a "Courses" search 
folder, every time I delete it and every time it returns.
the funny thing is the search results in that folder got nothing to do with 
the original search and seems random.

any advise as to how to erase permanently this search would be greatly 
appreciated.

Thanks,
YB.