Fedora :: Yum Clear Cache And RPM Update - Internal System Error

I just installed F9 and updated to F11 (fedora 11) and I updated the system because I couldn't get the media player working and then I installed all these packages for two days. I have tried yum clear cache and the rpm update. Here are some of the ones I tried:
rm -f /var/lib/rpm/__db*
yum update PackageKit
; yum clean all;

And this is the error:
Error Type: <type 'exceptions.TypeError'>
Error Value: 'NoneType' object is unsubscriptable
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 2280, in <module>
main()
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 2277, 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 508, in dispatch_command self.get_updates(filters)
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1743, in get_updates self._check_init()
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1965, 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&apos
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]