Phonegap Build Expert Needed -Android

I have an app which compiles through phonegap build and also Google Play publishes it fine. But when trying to install it on my android phone I get the following error message: "package file is invalid" The previous version of my app works fine and installs fine on android. The only changes I made to this version are I changed the keystore because phonegap build was complaining for some reason about my old key and wouldn't compile the app. The app compiles fine at phonegap build and it is publishable through Google Play (Google Play does not complain) need someone to fix this. Should be quick but of course I don't know. You need to be willing to work through teamviewer.