[android-developers] Error while updating app to android market?

Hi,

I want to upload new apk(updated version) for my app.But while
uploading new apk to market i am getting the following error.
"Market does not accept apks signed with the debug certificate. Create
a new certificate that is valid for at least 50 years."
I have made the certificate for 25years and uploaded the first version
in 2011.

how can i resolve this?

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