I know it's a case of silly me, but yum under F9 (3.2.14-10.fc9) backtraces when
I try "groupinstall <invalid group name>".  If you need anything else, just let
me know.

[root@localhost ~]# yum groupinstall @virtualization
Loaded plugins: refresh-packagekit
Setting up Group Process
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 241, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 116, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 311, in doCommands
    return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd,
self.extcmds)
  File "/usr/share/yum-cli/yumcommands.py", line 327, in doCommand
    return base.installGroups(extcmds)
  File "/usr/share/yum-cli/cli.py", line 859, in installGroups
    self.logger.error(_('Warning: Group %s does not exist.'), group_strng)
NameError: global name 'group_strng' is not defined