[CentOS] yum repository for development series explicitly

Dear Friends,

When I am running this command

yum install --enablerepo=milter-manager-development -y milter-manager

* So I am getting this error Message . *

milter-manager/primary | 7.0 kB 00:01 milter-manager 40/40 http://downloads.sourceforge.net/project/milter-manager/centos/6/development...: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404" Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: milter-manager-development. Please verify its path and try again

I have done.

yum clean all and yum update also.

I search on google but not getting any answer. Please help me to solve this problem.