pacman base base-dev returns ERROR: /mnt is not a mountpoint!

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https://bbs.archlinux.org – Hi,When I tried to install Arch(archlinux-2012.10.06-dual.iso) on VirtualBox 4.1.4, I meet the problem of "ERROR: /mnt is not a mountpoint!"Because I cannot remember the exact process and cannot find exactly the same instruction I used, the process was a little like below:# fdisk -l# mkfs.ext4 /dev/sda1# lsblk /dev/sda# pacman -Syy# pacman -Syu# pacman base base-devThen the system gave an error message:I've looked into the wiki instruction and done several search by google but had no luck. Hope some kind guy could lead me get out of trouble. photon https://bbs.archlinux (HowTos)