مشکل با دستور yum

[parsbin]

سلام
روی سرور Centos 5.3 نصب هستش.
موقع استفاده از دستور yum برای نصب هر چیزی ارور میگیرم.
مشکل چیه؟
 

کد: [انتخاب]

[root@srv58 ~]# yum clean all
Loaded plugins: fastestmirror
error: no dbpath has been set
error: cannot open Packages database in /%{_dbpath}
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 229, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 84, in main
    base.getOptionsConfig(args)
  File "/usr/share/yum-cli/cli.py", line 184, in getOptionsConfig
    enabled_plugins=self.optparser._splitArg(opts.enableplugins))
  File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 191, in _getConfig
    self._conf = config.readMainConfig(startupconf)
  File "/usr/lib/python2.4/site-packages/yum/config.py", line 754, in readMainConfig
    yumvars['releasever'] = _getsysver(startupconf.installroot, startupconf.distroverpkg)
  File "/usr/lib/python2.4/site-packages/yum/config.py", line 824, in _getsysver
    idx = ts.dbMatch('provides', distroverpkg)
TypeError: rpmdb open failed