FC7从本地光盘装软件包的问题

一开始要搜寻什么网络，后来按照网上的方法改过REPO以后，可以识别光盘中的RPM包了，可是到下载软件包时出现了错误，如下
Component: Software Manager
Summary: TB21f8f94d packages.py:485:getDiscNum:ValueError: invalid literal for int() with base 10: ''

Traceback (most recent call last):
  File "/usr/sbin/pirut", line 337, in _apply
    self.applyChanges(self.mainwin)
  File "/usr/lib/python2.5/site-packages/pirut/__init__.py", line 722, in applyChanges
    dlpkgs = self.downloadPackages(mainwin)
  File "/usr/lib/python2.5/site-packages/pirut/__init__.py", line 417, in downloadPackages
    probs = self.downloadPkgs(dlpkgs)
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 798, in downloadPkgs
    remote_pkgs.sort(mediasort)
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 747, in mediasort
    a = a.getDiscNum()
  File "/usr/lib/python2.5/site-packages/yum/packages.py", line 485, in getDiscNum
    return int(fragid)
ValueError: invalid literal for int() with base 10: ''

Local variables in innermost frame:
self: system-config-samba - 1.2.41-1.fc7.noarch
netloc:
fragid:
path: //1180276843.561677
query:
scheme: media

请问这是怎么回事啊？