yum issue and solution

auror

yesterday, I installed the fedroa 9 for arm.but can`t update by yum.
the error discription:
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 241, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 116, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 307, in doCommands
    self._getTs()
  File "/usr/lib/python2.5/site-packages/yum/depsolve.py", line 98, in _getTs
    self._getTsInfo()
  File "/usr/lib/python2.5/site-packages/yum/depsolve.py", line 104, in _getTsInfo
    self._tsInfo.setDatabases(self.rpmdb, self.pkgSack)
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 576, in
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 423, in _getSacks
    self._pkgSack.excludeArchs(archlist)
  File "/usr/lib/python2.5/site-packages/yum/packageSack.py", line 391, in excludeArchs
    sack.excludeArchs(archlist)
  File "/usr/lib/python2.5/site-packages/yum/sqlitesack.py", line 39, in newFunc
    return func(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/yum/sqlitesack.py", line 1021, in excludeArchs
    cur = cache.cursor()
AttributeError: 'NoneType' object has no attribute 'cursor'
solution:
yum clean all
edit /etc/yum.conf
set plugins to 0
               
               
               

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