Problem z yum search

[tomasfirst]

Witam jakis czs temu zaktualizowałem system Fedora 17 i od tamtego momentu mam problem z opcja search,  po uruchomieniu wyrzuca mi całą serie błędów ktore przedstawiam poniżej:
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 319, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 144, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 485, in doCommands
    return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd, self.extcmds)
  File "/usr/share/yum-cli/yumcommands.py", line 1496, in doCommand
    return base.search(extcmds)
  File "/usr/share/yum-cli/cli.py", line 1323, in search
    for (po, keys, matched_value) in matching:
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 2880, in searchGenerator
    for sack in self.pkgSack.sacks.values():
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 1013, in
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 779, in _getSacks
    self.repos.populateSack(which=repos)
  File "/usr/lib/python2.7/site-packages/yum/repos.py", line 309, in populateSack
    self.doSetup()
  File "/usr/lib/python2.7/site-packages/yum/repos.py", line 134, in doSetup
    self.retrieveAllMD()
  File "/usr/lib/python2.7/site-packages/yum/repos.py", line 84, in retrieveAllMD
    dl = repo._async and repo._commonLoadRepoXML(repo)
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 1365, in _commonLoadRepoXML
    result = self._getFileRepoXML(local, text)
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 1143, in _getFileRepoXML
    size=102400) # setting max size as 100K
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 950, in _getFile
    result = self.grab.urlgrab(misc.to_utf8(relative), local,
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 626, in
    grab = property(lambda self: self._getgrab())
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 621, in _getgrab
    self._setupGrab()
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 586, in _setupGrab
    urls = self.urls
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 806, in
    urls = property(fget=lambda self: self._geturls(),
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 803, in _geturls
    self._baseurlSetup()
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 769, in _baseurlSetup
    self.check()
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 513, in check
    'Cannot find a valid baseurl for repo: %s' % self.ui_id
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 387, in _ui_id
    if '$releasever' in val:
TypeError: argument of type 'Undefined' is not iterable

Czy może mi ktoś pomóc, bo nie wiem co zrobic by wyeliminować ten błąd, a niechce na nowo instalowac systemu.