I recently published 2 apps tot the Play market of android.
I signed both(from within netbeans) with the same keystore and same alias.
The first one I signed works as it should, the other gives the error “android package file was not signed correctly” when trying to install from market.
Any ideas as to what is wrong are appreciated.
You might have used the wrong key/alias when signing the file.
Source: http://developer.appcelerator.com/question/120663/how-do-you-resolve-or-troubleshoot-package-file-not-signed-correctly-error-from-android-app-in-market-place
You should also verify that you don’t have the debug copy still installed on your device.
Source: Published Android apk gives error "Package file was not signed correctly"