更新时出现的问题 不知道是怎么回事 帮忙解决一下

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Component: pirut
Summary: TB8f5a3431 yumRepo.py:749:_getRepoXML:RepoError: Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again

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 521, in <lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 381, in _getSacks
    self.repos.populateSack(which=repos)
  File "/usr/lib/python2.5/site-packages/yum/repos.py", line 239, in populateSack
    sack.populate(repo, mdtype, callback, cacheonly)
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 142, in populate
    if self._check_db_version(repo, mydbtype):
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 199, in _check_db_version
    if repo.repoXML.repoData.has_key(mdtype):
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 753, in <lambda>
    repoXML = property(fget=lambda self: self._getRepoXML(),
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 749, in _getRepoXML
    raise Errors.RepoError, (msg)
RepoError: Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again

Local variables in innermost frame:
msg: Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again
self: fedora
e: Cannot find a valid baseurl for repo: fedora