Cannot find original Android project certificate

Question

I am trying to upload a new APK file to GooglePlay. I have uploaded several updates for the same app before, but now I get this error:

I have no idea what's wrong here, especially since I've uploaded new APK's for this app before. Can someone enlighten me on what may be the problem, and how to fix it? Thanks!

Answer 1

The error is with the certificate (keystore) used to sign the application.

Did you sign the application? Or perhaps you are trying to upload a debug build (straight from eclipse for example)?.

An app needs to be signed with a keystore. They keystore is unique to you. If you loose it, your app can't be signed with another one. Google Play uses that as security, to ensure your app comes from you and not someone else.