Jeremy,Thank you very much! I have solved this problem following your suggest. Thanks again.

On Tue, Jul 15, 2008 at 10:05 PM, Jeremy Katz <katzj@redhat.com> wrote:
On Tue, 2008-07-15 at 13:29 +0800, Pollux Su wrote:
>     I'm a newer of livecd-creater.When I am creating live cd,"Failed
> to find group 'core':No groups available in any repository" error
> message appears.Following is my steps:

When running createrepo, you need to use the -g flag so that the group
metadata gets set up

Jeremy

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