That name is already in use in this folder
Member/library ops returned That name is already in use in this folder. (thatNameIsAlreadyInUse6). Closely related: A file or folder with that name already exists here.
Why this happens
Name collision in the current parent path after create, rename, or move.
Diagnose and fix
1. Pick a unique name or move into a different folder.
2. Delete/rename the conflicting item first.
3. See Moving folders is not supported yet. Deselect folders to move files only if a move mixed folders.
4. See Folders.