If you are getting below error when give 'yum update'

http://mirror.centos.org/centos-6/6....ta/repomd.xml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
Error: Cannot open/read repomd.xml file for repository: tejas-barot-vlc

Open the avrc6-tejas-barot-linux.repo file under /etc/yum/repos.d directory and update a line.

local@host# cd /etc/yum.repos.d
 # vim  avrc6-tejas-barot-linux.repo

Update  Enabled=1 to Enabled =0
# on blog(at)tejasbarot(dot)com
name=CentOS Repository for VLC Installation

Now, you can update using yum command.
# yum clean all
# yum update

You can upgrade and install all of  system software with latest version.