Errors on installing applications on Red Hat Linux

Hello there guys. I am learning to install applications on Linux Red Hat. I have managed to install an application called YUM that is an installer and updater. Now I get errors when trying to install. I get this error.

(process:3778): GLib-CRITICAL **: file gtimer.c: line 106 (g_timer_stop): assertion `timer != NULL' failed

(process:3778): 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

Thank you in advance guys.