Problem: OSError: [Errno 20] Not a directory
S3cmd:   1.5.0-alpha3

Traceback (most recent call last):
  File "./s3cmd", line 2094, in <module>
    main()
  File "./s3cmd", line 2034, in main
    cmd_func(args)
  File "./s3cmd", line 1193, in cmd_sync
    return cmd_sync_remote2local(args)
  File "./s3cmd", line 891, in cmd_sync_remote2local
    seq, total_size = _download(remote_list, seq, remote_count + update_count, total_size, dir_cache)
  File "./s3cmd", line 850, in _download
    raise e
OSError: [Errno 20] Not a directory