yum problem

[adel.essafi]

hi list
I am using FC4 under a proxy.
to use YUM, I did this (below). But i got a problem !!!
Can some one tell me what this problem is? is it a proxy problem?
Thanks
[root at localhost ~]# export
http_proxy="etudiant:student at 192.168.1.1:8080"
[root at localhost ~]# yum list
Setting up repositories
Traceback (most recent call last):
  File "/usr/bin/yum", line 15, in ?
    yummain.main(sys.argv[1:])
  File "/usr/share/yum-cli/yummain.py", line 72, in main
    result, resultmsgs = do()
  File "/usr/share/yum-cli/cli.py", line 454, in doCommands
    ypl = self.returnPkgLists()
  File "/usr/share/yum-cli/cli.py", line 1083, in returnPkgLists
    ypl = self.doPackageLists(pkgnarrow=pkgnarrow)
  File "__init__.py", line 838, in doPackageLists
  File "/usr/share/yum-cli/cli.py", line 72, in doRepoSetup
    yum.YumBase.doRepoSetup(self, thisrepo=thisrepo)
  File "__init__.py", line 208, in doRepoSetup
  File "repos.py", line 516, in baseurlSetup
  File "repos.py", line 768, in getMirrorList
  File
"/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line
444, in urlopen
    return default_grabber.urlopen(url, **kwargs)
  File
"/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line
575, in urlopen
    return self._retry(opts, retryfunc, url)
  File
"/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line
547, in _retry
    return apply(func, (opts,) + args, {})
  File
"/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line
574, in retryfunc
    return URLGrabberFileObject(url, filename=None, opts=opts)
  File
"/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line
727, in __init__
    self._do_open()
  File
"/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line
794, in _do_open
    fo, hdr = self._make_request(req, opener)
  File
"/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line
885, in _make_request
    fo = opener.open(req)
  File "/usr/lib/python2.4/urllib2.py", line 358, in open
    response = self._open(req, data)
  File "/usr/lib/python2.4/urllib2.py", line 376, in _open
    '_open', req)
  File "/usr/lib/python2.4/urllib2.py", line 337, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.4/urllib2.py", line 573, in <lambda>
    lambda r, proxy=url, type=type, meth=self.proxy_open: \
  File "/usr/lib/python2.4/urllib2.py", line 580, in proxy_open
    if '@' in host:
TypeError: iterable argument required
[root at localhost ~]# 

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