When I tried to install qbittorrent, it has stated giving repo error. stackis given. now i am not uble to install any software

Operating System: Fedora Core 11 X64_86

Error Log.
Traceback (most recent call last):
  File "/usr/share/PackageKit/helpers/yum/yumBackend.py", line 1649, in install_files
    txmbr = self.yumbase.installLocal(inst_file)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 3081, in installLocal
    tx_return.extend(self.install(po=po))
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 2623, in install
    if self.tsInfo.exists(pkgtup=po.pkgtup):
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 655, in <lambda>
    tsInfo = property(fget=lambda self: self._getTsInfo(),
  File "/usr/lib/python2.6/site-packages/yum/depsolve.py", line 112, in _getTsInfo
    pkgSack = self.pkgSack
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 646, in <lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 488, in _getSacks
    self.repos.populateSack(which=repos)
  File "/usr/lib/python2.6/site-packages/yum/repos.py", line 260, in populateSack
    sack.populate(repo, mdtype, callback, cacheonly)
  File "/usr/lib/python2.6/site-packages/yum/yumRepo.py", line 162, in populate
    if self._check_db_version(repo, mydbtype):
  File "/usr/lib/python2.6/site-packages/yum/yumRepo.py", line 220, in _check_db_version
    return repo._check_db_version(mdtype)
  File "/usr/lib/python2.6/site-packages/yum/yumRepo.py", line 1174, in _check_db_version
    repoXML = self.repoXML
  File "/usr/lib/python2.6/site-packages/yum/yumRepo.py", line 1337, in <lambda>
    repoXML = property(fget=lambda self: self._getRepoXML(),
  File "/usr/lib/python2.6/site-packages/yum/yumRepo.py", line 1333, in _getRepoXML
    raise Errors.RepoError, msg
RepoError: Cannot retrieve repository metadata (repomd.xml) for repository: qbittorrent. Please verify its path and try again