Hello
The issue is not about the fs version. It fails while installing GRUB on the destination, it seems stage1 file in missing in /boot/grub (i.e. it is missing on source too)
One thing you could try is reinstall grub on source or copy /boot/grub from another machine with the same version. However take into consideration this can be a dangerous operation (e.g. rending the machine unbootable if anything goes wrong).
The other way would be to reconfigure manually. The error is during reconfig, which means all data have been cloned successfully. Perhaps the destination VM has been deleted. There is a setting in worker's config xml not to delete it if the cloning succeeds - look for <powerOffHelperVm>, set to false, and restart worker service. Manual reconfig is a tricky thing that involves booting the destination from a live CD. Have a look at this post for more details
HTH
Plamen