[chef] installation problem with 0.7.8

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I am trying to install chef today and I got the following error when running 

chef-solo -c /etc/chef/solo.rb -j /etc/chef/chef.json -r
http://s3.amazonaws.com/chef-solo/bootstrap-0.7.8.tar.gz

ERROR:
[Wed, 19 Aug 2009 12:48:14 -0400] ERROR: package[rubygem-chef-server-slice]
(/tmp/chef-solo/cookbooks/chef/recipes/server.rb line 52) had an error:
yum failed - #<Process::Status: pid=18313,exited(2)> - returns: python: can't
open file
'/usr/lib/ruby/gems/1.8/gems/chef-0.7.4/lib/chef/provider/package/yum-dump.py':
[Errno 2] No such file or directory

seems like its looking for /usr/lib/ruby/gems/1.8/gems/chef-0.7.4/ which may
really be /usr/lib/ruby/gems/1.8/gems/chef-0.7.8/

what should I do to deal with the issue?