yum update of yum breaks yum

On CentOS 4 I did a 'yum -y update yum'  from 
yum.noarch 2.4.3-1.c4 to yum.noarch 2.4.3-4.el4.centos. The update succeeded, but the next invocation of yum warned:
Warning: cache file is version 6, we need 10, will regenerate
and failed (see below). How can I repair this?

[root@yyyyyyyy ]# cat /etc/redhat-release 
CentOS release 4.3 (Final)
[root@yyyyyyyy ]# uname -a
Linux yyyyyyyy.zzz 2.6.9-34.EL #1 Wed Mar 8 00:07:35 CST 2006 i686 i686 i386 GNU/Linux
[root@yyyyyyyy]# rpm -q glibc python
glibc-2.3.4-2.19
python-2.3.4-14.2

[root@yyyyyyyy ]# yum update yum
Setting up Update Process
Setting up repositories
Reading repository metadata in from local files
Excluding Packages in global exclude list
Finished
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for yum to pack into transaction set.
yum-2.4.3-4.el4.centos.no 100%  |=========================|  18 kB    00:00     
---> Package yum.noarch 0:2.4.3-4.el4.centos set to be updated
--> Running transaction check
--> Processing Dependency: yum-metadata-parser for package: yum
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for yum-metadata-parser to pack into transaction set.
yum-metadata-parser-1.0-8 100% |=========================| 3.9 kB    00:00 ---> Package yum-metadata-parser.i386 0:1.0-8.el4.centos set to be updated
--> Running transaction check

Dependencies Resolved

=============================================================================
 Package                 Arch        Version          Repository        Size 
=============================================================================
Updating:
 yum                     noarch     2.4.3-4.el4.centos  base              386 k
Installing for dependencies:
 yum-metadata-parser     i386       1.0-8.el4.centos  base               23 k

Transaction Summary
=============================================================================
Install      1 Package(s)          
Update       1 Package(s)         
Remove       0 Package(s)         
Total download size: 409 k
Is this ok [y/N]: y
Downloading Packages:
(1/2): yum-2.4.3-4.el4.ce 100% |=========================| 386 kB    00:00     
(2/2): yum-metadata-parse 100% |=========================|  23 kB    00:00     
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing: yum-metadata-parser          ######################### [1/3] 
  Updating  :  yum                                                    [2/3]warning: /etc/yum.conf created as /etc/yum.conf.rpmnew
  Updating  : yum                          ######################### [2/3] 
  Cleanup   : yum                          ######################### [3/3]

Dependency Installed: yum-metadata-parser.i386 0:1.0-8.el4.centos
Updated: yum.noarch 0:2.4.3-4.el4.centos
Complete!

[root@yyyyyyyy ]# yum list updates
Setting up  repositories
Reading repository metadata in from local files
Warning: cache file is version 6, we need 10, will regenerate

(process:27666): GLib-CRITICAL **: file gtimer.c: line 106 (g_timer_stop): assertion `timer != NULL' failed

(process:27666): 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 512, in doCommands
    ypl = self.returnPkgLists()
  File "/usr/share/yum-cli/cli.py", line 1176, in returnPkgLists
    ypl = self.doPackageLists(pkgnarrow=pkgnarrow)
  File "__init__.py", line 904, in doPackageLists
  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

       
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