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Description of problem:
Bug caught during a virtual guest install of rhel6 from this build.
http://download.devel.redhat.com/devel/candidate-trees/RHEL6.0-20101026.0/
Steps to Reproduce:
When choosing what additional repositories to select during installation...
1. Uncheck "Red Hat Enterprise Linux"
2. Check and Select "High Availability"
3. Click radio Customize now
4. Click Next
BANG
Unhandled exception
See the attached screenshot, it shows what happened.
The traceback you are seeing is usually indicative of tree instability or changes that are in process. This sometimes happens with nightly trees is the comps file is undergoing changes or if rel-eng did an incomplete tree build. Try with a more current nightly tree and see if the problem still happens.