[rancid] error no 4

[roya dehbateh]

hi I;ve got stuck in a problem for awhile, could you help me?
  when I type " >> yum install .....(anything)
  this error is shown :
  cant find a valid baseurl for repo:extras
  couldnt retrieve mirrorlist http://mirror.fedoraproject.org/mirrorlist?repo=extras-6&arch=i386 error was Error No 4 .
  I dont know what should I do.

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