its good now.
I removed jenkins.repo using
// [root@jenk yum.repos.d]# sudo rm -r jenkins.repo (to remove jenkins.repo)
later i did
[root@jenk yum.repos.d]# sudo wget -O /etc/yum.repos.d/jenkins.repo \
https://pkg.jenkins.io/redhat-stable/jenkins.repo
now its not throwing any errors…
Its fine now