I've been fighting the same issue for the past day. 6.0 obviously doesn't have a hd install option like the other versions. Getting the same error.

Looks like the live cd is mounted on /mnt-system when it boots, but I placed those files in the root directory of my empty partition.

Tried creating /mnt-system to mimic live cd with no luck. I'll keep tinkering but if anybody has any solutions please share.

scsand