Yum Install Gcc

I tried to : yum install gcc

Quote:

root@name [~]# yum install gcc
Traceback (most recent call last):
File "/usr/bin/yum", line 28, in ?
import yummain
File "/usr/share/yum-cli/yummain.py", line 30, in ?
from yum import _
ImportError: cannot import name _

command : rpm -q yum

Quote:

root@name [~]# rpm -q yum
yum-3.2.8-9.el5.centos.2.1

command : rpm -ap | grep yum

Quote:

root@name [~]# rpm -aq | grep yum
yum-3.2.8-9.el5.centos.2.1
yum-fastestmirror-1.1.10-9.el5.centos
yum-metadata-parser-1.1.2-2.el5

command : rpm -e yum-metadata-parser-1.0-8.fc6

Quote:

root@name [~]# rpm -e yum-metadata-parser-1.0-8.fc6
error: package yum-metadata-parser-1.0-8.fc6 is not installed