cannot install iptables on centos

[root@grants-vps ~]# sudo yum install iptables-services -y Loaded plugins: fastestmirror Setting up Install Process Loading mirror speeds from cached hostfile

this is the error message, almost everything i try to install gives me this error.

Can someone please tell me why?

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Have you tried to install EPEL repository? You can do that using the following commands:

yum -y update yum -y install epel-release yum repolist

then run as root:

yum install iptables-services -y