yum update error

[Osama Mahdi]

Hi guys,

I got the bellow error when I issued the "yum update" command:

Downloading Packages:
Running rpm_check_debug
ERROR with rpm_check_debug vs depsolve:
Package glibc-devel needs glibc = 2.7-2, this is not available.
Package glibc-devel needs glibc-headers = 2.7-2, this is not available.
Package glibc-devel needs glibc-headers = 2.7-2, this is not available.
Package glibc-devel needs glibc = 2.7-2, this is not available.
Complete!

How can solve this problem please? and by the way now I am getting the 
same error for any package that I tried to install.

Thanks
OS