# yum update
Loading "installonlyn" plugin
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files
Traceback (most recent call last):
File "/usr/bin/yum", line 29, in ?
yummain.main(sys.argv[1:])
File "/usr/share/yum-cli/yummain.py", line 94, in main
result, resultmsgs = base.doCommands()
File "/usr/share/yum-cli/cli.py", line 381, in doCommands
return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd, self.extcmds)
File "/usr/share/yum-cli/yumcommands.py", line 150, in doCommand
return base.updatePkgs(extcmds)
File "/usr/share/yum-cli/cli.py", line 696, in updatePkgs
updating_pkg = self.getPackageObject(new)
File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 1473, in getPackageObject
pkgs = self.pkgSack.searchPkgTuple(pkgtup)
File "/usr/lib/python2.4/site-packages/yum/packageSack.py", line 66, in searchPkgTuple
return self.searchNevra(name=n, arch=a, epoch=e, ver=v, rel=r)
File "/usr/lib/python2.4/site-packages/yum/packageSack.py", line 232, in searchNevra
return self._computeAggregateListResult("searchNevra", name, epoch, ver, rel, arch)
File "/usr/lib/python2.4/site-packages/yum/packageSack.py", line 369, in _computeAggregateListResult
sackResult = apply(method, args)
File "/usr/lib/python2.4/site-packages/yum/sqlitesack.py", line 574, in searchNevra
returnList.append(self.pc(rep,self.db2class(x)))
File "/usr/lib/python2.4/site-packages/yum/sqlitesack.py", line 431, in db2class
y.checksum = {'pkgid': 'YES','type': db.checksum_type,
File "/usr/lib/python2.4/site-packages/sqlite/main.py", line 97, in __getattr__
raise AttributeError, key
AttributeError: CHECKSUM_VALUE

Any ideas on how to fix this??

Anytime you ask a question provide your distro, version, and arch (F8-64bit).

Have you been mixing repos?