Jumpstart ZFS snapshot issue

I've run into this issue with  the extraction of a Flash using jumpstart...

        Extracted 4236.00 MB ( 99% of 4253.81 MB archive)
        Extracted 4237.00 MB ( 99% of 4253.81 MB archive)
        Extracted 4237.25 MB ( 99% of 4253.81 MB archive)

ERROR: Errors occured during the extraction of flash archive. The file /tmp/flash_errors contains the list of errors encountered

ERROR: Could not extract Flash archive

ERROR: Flash installation failed
Solaris installation program exited.
# cat /tmp/flash_errors
cannot receive new filesystem stream: destination has snapshots (eg. rpool/ROOT/sol10_U9_2@zflash.110824.10.08)
must destroy them to overwrite it
# zfs list
NAME                                        USED  AVAIL  REFER  MOUNTPOINT
rpool                                      8.01G  58.9G    21K  /a/rpool
rpool/ROOT                                 4.44G  58.9G    21K  legacy