problem in yum

I am recieving an error when try to excute yum update

[root@rabab ~]# yum update
Repository base is listed more than once in the configuration
base                      100% |=========================| 2.1 kB    00:00
updates-released          100% |=========================| 2.3 kB    00:00
primary.sqlite.bz2        100% |=========================| 2.3 MB    00:00
Excluding Packages in global exclude list
Finished
Traceback (most recent call last):
 File "/usr/bin/yum", line 29, in <module>
   yummain.main(sys.argv[1:])
 File "/usr/share/yum-cli/yummain.py", line 105, in main
   result, resultmsgs = base.doCommands()
 File "/usr/share/yum-cli/cli.py", line 287, in doCommands
   self._getTs()
 File "/usr/lib/python2.5/site-packages/yum/depsolve.py", line 85, in _getTs
   self._getTsInfo()
 File "/usr/lib/python2.5/site-packages/yum/depsolve.py", line 91, in
_getTsInfo
   self._tsInfo.setDatabases(self.rpmdb, self.pkgSack)
 File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 529, in
<lambda>
   pkgSack = property(fget=lambda self: self._getSacks(),
 File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 388, in
_getSacks
   self._pkgSack.excludeArchs(archlist)
 File "/usr/lib/python2.5/site-packages/yum/packageSack.py", line 352, in
excludeArchs
   sack.excludeArchs(archlist)
 File "/usr/lib/python2.5/site-packages/yum/sqlitesack.py", line 817, in
excludeArchs
   executeSQL(cur, myq)
 File "/usr/lib/python2.5/site-packages/yum/sqlutils.py", line 159, in
executeSQLQmark
   return cursor.execute(query)
sqlite3.OperationalError: unable to open database file


b/r

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