l-i-f-ui Failed during swap creation

I tried to create an image for Overo with 11.10 using the bzr (rev 456) and enabled swap; it failed with the following in the bottom of the log:

Creating SWAP File

Traceback (most recent call last):
  File "/home/dg/linaro/tools/linaro-image-tools/linaro-media-create", line 184, in <module>
    board_config.mmc_part_offset, board_config)
  File "/home/dg/linaro/tools/linaro-image-tools/linaro_image_tools/media_create/rootfs.py", line 81, in populate_rootfs
    proc.wait()
  File "/home/dg/linaro/tools/linaro-image-tools/linaro_image_tools/cmd_runner.py", line 100, in wait
    raise SubcommandNonZeroReturnValue(self._my_args, returncode)
linaro_image_tools.cmd_runner.SubcommandNonZeroReturnValue: Sub process "['mkswap', '/tmp/tmpzdPrys/root-disc/SWAP.swap']" returned a non-zero value: 1

This is on an ubuntu lucid 32bit host.

Dave