Update manager 12.04 Failed to download repository info [closed]

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http://askubuntu.com – Possible Duplicate: How can I fix a 404 Error using a PPA? My update manager keep showing error W:Failed to fetch http://ppa.launchpad.net/pmcenery/ppa/ubuntu/dists/precise/main/source/S... 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/pmcenery/ppa/ubuntu/dists/precise/main/binary-i... 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead. Please any solution. (HowTos)