Software Update - Internal System Error

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http://forums.fedoraforum.org – I've upgraded from FC11 to FC12 32-bit (live CD to HD install). Now when I try to perform software updates it gives me an Internal System Error. I've clicked on more details and it gives me the following: Code: Error Type: <class 'yum.Errors.RepoError'> Error Value: Error getting repository data for installed, repository not found   File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 3125, in <module>     main()   File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 3122, in main     backend.dispatcher(sys.argv[1:])   File : /usr/lib/python2.6/site-packages/packagekit/backend.py, line 710, in dispatcher     self.dispatch_command(args[0], args[1:])   File : /usr/lib/python2.6/site-packages/packagekit/backend.py, line 657, in dispatch_command     self.update_packages(only_trusted, package_ids)   File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1948, in update_packages     signed = self._is_package_repo_signed(pkg)   File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1437, in _is_package_repo_signed     repo = self.yumbase.repos.getRepo(pkg.repoid)   File : /usr/lib/python2.6/site-packages/yum/repos.py, line 121, in getRepo     'Error getting repository data for $s, repository not found' $ (repoid) Everything else seems to work, including all of the programs I've installed from non-Fedora sources i.e. DOSEmu, Adobe Flash plug-in and Cannon LBP-660 printer driver. Anyone know what the problem could be? Sorry about posting this in the wrong place before, I hope I've got it right this time. Thanks in advance. (HowTos)