https://www.google.com/search?q=http...repomd.xml%3A+[Errno+14]+PYCURL+ERROR+22+-+%22The+requested+URL+returned+error%3A+404%22+&ie =utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

در گوگل سرچ کنید
http://mirror.centos.org/centos/6/ad...ta/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"