fedora 10 에서 packagekit 을 이용한 update problem

안녕하세요 fedora 10 64bit영문버젼으로 사용중인데 어느날 갑자기 업데이트를 하려는데 아래의 길고긴 문장이나오면서

업데이트또는 아예 패키지킷을 이용한 패키지검색조차도 안되더군요, 파이선에 문제인지 모르겟네요 고수님들의 조언부탁드립니다

Error Type:
Error Value: 'NoneType' object is unsubscriptable
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 2314, in
main()
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 2311, in main
backend.dispatcher(sys.argv[1:])
File : /usr/lib/python2.5/site-packages/packagekit/backend.py, line 600, in dispatcher
self.dispatch_command(args[0], args[1:])
File : /usr/lib/python2.5/site-packages/packagekit/backend.py, line 562, in dispatch_command
self.search_group(options, searchterms)
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 439, in search_group
self._check_init(lazy_cache=True)
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1995, in _check_init
self.yumbase.repos.doSetup()
File : /usr/lib/python2.5/site-packages/yum/repos.py, line 71, in doSetup
self.ayum.plugins.run('postreposetup')
File : /usr/lib/python2.5/site-packages/yum/plugins.py, line 178, in run
func(conduitcls(self, self.base, conf, **kwargs))
File : /usr/lib/yum-plugins/rpm-warm-cache.py, line 32, in postreposetup_hook
cmd = commands[0]