It's because KLoxo-MR think your OS is CentOS 5 instead CentOS 6.
Follow this steps:
cd /tmp
rm -f mratwork*
rpm -Uvh https://github.com/mustafaramadhan/kloxo/raw/rpms/release/neutral/noarch/mratwork-release-0.0.1-1.noarch.rpm
cd /
yum clean all
yum update mratwork-* -y
sed -i 's/\$releasever/6/' /etc/yum.repos.d/mratwork.repo
yum install kloxomr -y
sh /script/upcp