不知道怎么办是好！
fedora 7的
软件添加／删除无法启动，不知道是怎么回事？请
高手帮帮忙，要怎么解决？
下面是错误信息：
Component: Software Manager
Summary: TB429a3a99 yumRepo.py:593:setup:RepoError: Cannot open/read repomd.xml file for repository: a_local
Traceback (most recent call last):
File "/
usr/sbin/pirut", line 427, in <module>
main()
File "/usr/sbin/pirut", line 420, in main
pm = PackageManager(options.config, options.onlyrepo)
File "/usr/sbin/pirut", line 60, in __init__
GraphicalYumBase.__init__(self, False, config)
File "/usr/lib/python2.5/site-packages/pirut/__init__.py", line 126, in __init__
self.reset()
File "/usr/lib/python2.5/site-packages/pirut/__init__.py", line 224, in reset
self.closeRpmDB()
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 295, in closeRpmDB
self.comps = None
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 512, in <lambda>
fset=lambda self, value: self._setGroups(value),
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 437, in _setGroups
for repo in self.repos.listGroupsEnabled():
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 492, in <lambda>
repos = property(fget=lambda self: self._getRepos(),
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 335, in _getRepos
repo.setup(self.conf.cache, self.mediagrabber)
File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 593, in setup
raise Errors.RepoError, ('Cannot open/read repomd.xml file for repository: %s' % self)
RepoError: Cannot open/read repomd.xml file for repository: a_local
Local variables in innermost frame:
self: a_local
cache: 0
e: failure: repodata/repomd.xml from a_local: [Errno 256] No more mirrors to try.
mediafunc: None
