Update error

Hi

I have a problem with the yum update!
The machine crashed during the update and now it is not possible to finish the update.

This is the error:
#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 673, in updatePkgs
self.doRepoSetup()
File "/usr/share/yum-cli/cli.py", line 109, in doRepoSetup
self.doSackSetup(thisrepo=thisrepo)
File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 341, in doSackSetup
self.pkgSack.excludeArchs(archlist)
File "/usr/lib/python2.4/site-packages/yum/packageSack.py", line 331, in excludeArchs
sack.excludeArchs(archlist)
File "/usr/lib/python2.4/site-packages/yum/sqlitesack.py", line 589, in excludeArchs
obj = 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

I need help!!

Timmi