Error with custom bootable install CD

[Simper, Brian D]

I have a custom built bootable CD but I am getting errors when I go to
use it.  The traceback ends with these lines:

File "/usr/lib/anaconda/hdrlist.py", line 900, in groupSetFromCompsFile
  for pnevra in (grpset.groups["base"].packages.keys() +
KeyError: base

> /usr/lib/anaconda/hdrlist.py(900)groupSetFromCompsFile()
-> for pnevra in (grpset.groups["base"].packages.keys() +


Does anyone recognize this error?  What is "pnevra"?  I do not have it
listed in any file within the kickstart file or the resulting ISO.
Google absolutely does not have any references for it.  

I am running Red Hat Enterprise Linux WS 3.0.  The CD will boot a server
and kickstart is being consulted.  I do have a "Base" group in my
comps.xml file.  Any ideas on what might be happening?

Brian