Got this reported to me:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    An unexpected error has occurred.
  Please report the following lines to:
   s3tools-bugs@lists.sourceforge.net
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Problem: KeyError: 'dest_name'
S3cmd:   0.9.9.91

Traceback (most recent call last):
  File "/usr/bin/s3cmd", line 1736, in <module>
    main()
  File "/usr/bin/s3cmd", line 1681, in main
    cmd_func(args)
  File "/usr/bin/s3cmd", line 582, in cmd_mv
    subcmd_cp_mv(args, s3.object_move, "move", "File %(src)s moved to %(dst)s")
  File "/usr/bin/s3cmd", line 568, in subcmd_cp_mv
    dst_uri = S3Uri(item['dest_name'])
KeyError: 'dest_name'

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    An unexpected error has occurred.
    Please report the above lines to:
   s3tools-bugs@lists.sourceforge.net
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


--
"This isn't right. This isn't even wrong."

-  Wolfgang Pauli, on a paper submitted by a physicist colleague