Estoy intentando actualizar mi Centos 4 con yum pero me sale este error

alguien podria ayudarme a solucionarlo???

gracias

Setting up Install Process
Setting up repositories
Reading repository metadata in from local files

(process:15034): GLib-CRITICAL **: file gtimer.c: line 106 (g_timer_stop): assertion `timer != NULL' failed

(process:15034): GLib-CRITICAL **: file gtimer.c: line 88 (g_timer_destroy): assertion `timer != NULL' failed
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 97, in main
result, resultmsgs = do()
File "/usr/share/yum-cli/cli.py", line 470, in doCommands
return self.installPkgs()
File "/usr/share/yum-cli/cli.py", line 836, in installPkgs
self.doRepoSetup()
File "/usr/share/yum-cli/cli.py", line 75, in doRepoSetup
self.doSackSetup(thisrepo=thisrepo)
File "__init__.py", line 260, in doSackSetup
File "repos.py", line 277, in populateSack
File "/usr/lib/python2.3/site-packages/sqlitecachec.py", line 40, in getPrimary
self.repoid))
TypeError: Can not create index on requires table: near "NOT": syntax error
[root@mail /]# clear

[root@mail /]# yum update
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files

(process:15042): GLib-CRITICAL **: file gtimer.c: line 106 (g_timer_stop): assertion `timer != NULL' failed

(process:15042): GLib-CRITICAL **: file gtimer.c: line 88 (g_timer_destroy): assertion `timer != NULL' failed
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 97, in main
result, resultmsgs = do()
File "/usr/share/yum-cli/cli.py", line 477, in doCommands
return self.updatePkgs()
File "/usr/share/yum-cli/cli.py", line 955, in updatePkgs
self.doRepoSetup()
File "/usr/share/yum-cli/cli.py", line 75, in doRepoSetup
self.doSackSetup(thisrepo=thisrepo)
File "__init__.py", line 260, in doSackSetup
File "repos.py", line 277, in populateSack
File "/usr/lib/python2.3/site-packages/sqlitecachec.py", line 40, in getPrimary
self.repoid))
TypeError: Can not create index on requires table: near "NOT": syntax error

[root@mail /]#