Description of problem:
Pirut fatal exception error

Version-Release number of selected component (if applicable):


How reproducible:
Launch Pirut and receive fatal exception error notification 


Steps to Reproduce:
1.
2.
3.
  
Actual results:
Traceback (most recent call last):
  File "/usr/sbin/pup", line 650, in <module>
    main()
  File "/usr/sbin/pup", line 643, in main
    pup = PackageUpdater(not options.autoapply, options.config)
  File "/usr/sbin/pup", line 88, in __init__
    GraphicalYumBase.__init__(self, False, config)
  File "/usr/lib/python2.5/site-packages/pirut/__init__.py", line 124, in __init__
    self.reset()
  File "/usr/lib/python2.5/site-packages/pirut/__init__.py", line 223, in reset
    self.doTsSetup()
  File "/usr/lib/python2.5/site-packages/yum/depsolve.py", line 64, in doTsSetup
    return self._getTs()
  File "/usr/lib/python2.5/site-packages/yum/depsolve.py", line 78, in _getTs
    self._tsInfo.setDatabases(self.rpmdb, self.pkgSack)
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 517, in <lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 377, in _getSacks
    self.repos.populateSack(which=repos)
  File "/usr/lib/python2.5/site-packages/yum/repos.py", line 211, in populateSack
    self.doSetup()
  File "/usr/lib/python2.5/site-packages/yum/repos.py", line 66, in doSetup
    self.ayum.plugins.run('postreposetup')
  File "/usr/lib/python2.5/site-packages/yum/plugins.py", line 169, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File "/usr/lib/yum-plugins/fastestmirror.py", line 80, in postreposetup_hook
    repomirrors[str(repo)] = FastestMirror(repo.urls).get_mirrorlist()
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 512, in <lambda>
    urls = property(fget=lambda self: self._geturls(),
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 509, in _geturls
    self._baseurlSetup()
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 492, in _baseurlSetup
    self.check()
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 360, in check
    'Cannot find a valid baseurl for repo: %s' % self.id
RepoError: Cannot find a valid baseurl for repo: core

Local variables in innermost frame:
self: core


Expected results:
to update core 7 

Additional info:
Yum fails also