spacewalk-repo-sync fails with " Cannot retrieve repository metadata (repomd.xml) for repository "

Issue

• spacewalk-repo-sync command fails with " Cannot retrieve repository metadata (repomd.xml) for repository "

  # spacewalk-repo-sync --channel cp-addons-rhel5-x86_64 --type yum -u http://satellite.example.com/yum/rhel5_all
  Traceback (most recent call last):
    File "/usr/bin/spacewalk-repo-sync", line 72, in ?
      sys.exit(abs(main() or 0))
    File "/usr/bin/spacewalk-repo-sync", line 66, in main
      sync.main()
    File "/usr/share/rhn/satellite_tools/reposync.py", line 103, in main
      self.import_packages(plugin, url)
    File "/usr/share/rhn/satellite_tools/reposync.py", line 135, in import_packages
      packages = plug.list_packages()
    File "/usr/share/rhn/satellite_tools/repo_plugins/yum_src.py", line 73, in list_packages
      sack.populate(repo, 'metadata', None, 0)
    File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 168, in populate
      if self._check_db_version(repo, mydbtype):
    File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 226, in _check_db_version
      return repo._check_db_version(mdtype)
    File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1226, in _check_db_version
      repoXML = self.repoXML
    File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1399, in <lambda>
      repoXML = property(fget=lambda self: self._getRepoXML(),
    File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 1395, in _getRepoXML
      raise Errors.RepoError, msg
  yum.Errors.RepoError: Cannot retrieve repository metadata (repomd.xml) for repository: cp-addons-rhel5-x86_64. Please verify its path and try again.