LinuxQuestions.org - Yum, Yumex problem

Fc7, x86_64.
Try to run run yumex and can't find any repo's, this is just one example of
all the repo's it can't find:

Failure getting http://mirror.stanford.edu/fedora/li.../comps-f7.xml:
15:41:12 : --> [Errno -1] Metadata file does not match checksum

This is as far as it will go,stops here :failure: repodata/comps-f7.xml from updates: [Errno 256] No more mirrors to try.

Yum on the command line updates, install, remove with no errors.
I have run "yum clean all" (without quotes) .

pirut, it won't run, if I do a yum clean all from Yumex, this a error message about pirut:

Component: pirut
Summary: TB11af5ff9 grabber.py:1219:_do_grab:OSError: [Errno 2] No such file or directory: '//var/cache/yum/fedora/comps-f7.xml'

Traceback (most recent call last):
File "/usr/sbin/pirut", line 441, in <module>
main()
File "/usr/sbin/pirut", line 434, in main
pm = PackageManager(options.config, options.onlyrepo)
File "/usr/sbin/pirut", line 61, in __init__
GraphicalYumBase.__init__(self, False, config)
File "/usr/lib/python2.5/site-packages/pirut/__init__.py", line 124, in __init__
self.reset()
File "/usr/lib/python2.5/site-packages/pirut/__init__.py", line 226, in reset
self.doGroupSetup()
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 454, in doGroupSetup
return self._getGroups()
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 500, in _getGroups
groupfile = repo.getGroups()
File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 868, in getGroups
file = self.retrieveMD('group')
File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 839, in retrieveMD
cache=self.http_caching == 'all')
File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 607, in _getFile
http_headers=headers,
File "/usr/lib/python2.5/site-packages/urlgrabber/mirror.py", line 411, in urlgrab
return self._mirror_try(func, url, kw)
File "/usr/lib/python2.5/site-packages/urlgrabber/mirror.py", line 397, in _mirror_try
return func_ref( *(fullurl,), **kwargs )
File "/usr/lib/python2.5/site-packages/urlgrabber/grabber.py", line 927, in urlgrab
return self._retry(opts, retryfunc, url, filename)
File "/usr/lib/python2.5/site-packages/urlgrabber/grabber.py", line 845, in _retry
r = apply(func, (opts,) + args, {})
File "/usr/lib/python2.5/site-packages/urlgrabber/grabber.py", line 915, in retryfunc
fo._do_grab()
File "/usr/lib/python2.5/site-packages/urlgrabber/grabber.py", line 1219, in _do_grab
os.utime(self.filename, (modified_stamp, modified_stamp))
OSError: [Errno 2] No such file or directory: '//var/cache/yum/fedora/comps-f7.xml'

Local variables in innermost frame:
self: <urlgrabber.grabber.URLGrabberFileObject instance at 0x2958e60>
amount: None
modified_stamp: 1183492956.0
new_fo: <closed file '//var/cache/yum/fedora/comps-f7.xml', mode 'wb' at 0x295b3f0>
bs: 8192
modified_tuple: (2007, 7, 3, 20, 2, 36, 0, 1, 0, 0)
ValueError: unpack non-sequence
block:
size: 1111118