nixOS graphical install iso error

# Following is the error returned to stdout running the nixOS graphical install iso.
# Steps leading up to error.
# Installing in VMware Workstation 10, new Guest on 20GB disk, config nixOS iso as install source
# Following official online nxOS Manual
# From nixOS KDE envionment
# Run KDE partitioner. Created, using "msdos" disk table, 1GB /dev/sda1 linux-swap, 19GB /dev/sda2 ext4
# Mount disk with "mount /dev/sda2 /mnt/"
# Install config files with "nixos-generate-config --rooot /mnt"
# Modify configuration.nix as follows http://pastebin.com/r62ueAcS
# Run install with "nixos-install"
# Runs successfully until it reaches this pastebin output (I've included the last successul task)


*** Copying ‘/nix/store/5n6dd7i1h3anw017paxm27mwaq4aaj8p-nixos-14.12.471.1f09b77’ from ‘/tmp/root/nix/store/5n6dd7i1h3anw017paxm27mwaq4aaj8p-nixos-14.12.471.1f09b77’

created 1 symlinks in user environment
finalising the installation...
updating GRUB 2 menu...
installing the GRUB 2 boot loader on /dev/sda2...
Installing for i386-pc platform.
/nix/store/ndzya2b420gjkgjvylj8lj1cg00lv157-grub-2.02-git-1de3a4/sbin/grub-install: warning: File system `ext2' doesn't support embedding.
/nix/store/ndzya2b420gjkgjvylj8lj1cg00lv157-grub-2.02-git-1de3a4/sbin/grub-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
/nix/store/ndzya2b420gjkgjvylj8lj1cg00lv157-grub-2.02-git-1de3a4/sbin/grub-install: error: will not proceed with blocklists.
/nix/store/xcni2yv1dkbi07028rn7ha4cqiz3fv7b-install-grub.pl: installation of GRUB on /dev/sda2 failed