[CentOS] CentOS 6 DVD install "Unable to read group information from repositories"

Tried my first CentOS 6 install on a system currently running 5.6.  My
attempt was not an upgrade, but a full re-format.  I have verified the
checksums of the ISO and did the pre-install disk verify and everything
checked out.  However after the screen for setting up the bootloader I get
the following error

"Unable to read group information from repositories.  This is a problem with
the generation of your install tree"

With my only options being "Exit Install" and "Retry", but of course "Retry"
continues to fail with the same message.

Basically I chose the first option in the menu for the DVD, install /
upgrade, went through all the settings, did a custom layout for
partitioning.  I basically told the installer to re-format my ext3
partitions to ext4 and set the mount points for / , /boot and swap.  Then
after selecting "Next" from the bootloader configuration is when I get the
above error.

Thanks
- Trey
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