fedora 12 update error

[sandeep Patel]

hello,
         I have installed fedora 12 in my laptop.Then i tried to update but
i found error this type of error.
Error: Cannot retrieve repository metadata (repomd.xml) for repository:
fedora.
Please suggest me how to eliminate this problem.
-- 
Sandeep Kumar Patel
University of Hyderabad
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