It Can't be deleted


I indexed my document folder which has 9485 files
such as txt,png,etc to main inbox by mistake.
the folder was supposed to be moved to other database.

The thing is that it can’t be deleted and moved
I want to either delete it or move to other database
but I can not do anything about it.
The only thing I can do about that forder of Inbox is to open it and check

It seems like the only way I can delete that folder is to delete devon think
and install it again.
Is there anybody who has the answer??