"App not installed" error

I installed Badland from Play Store. It worked. Then I uninstalled it and tried installing it from Amazon Appstore. Every time I try to install it, I get the installing screen for about a minute (long time) and then the error "App not installed" I found the apk file (from my filesystem, the one Amazon downloaded) and the exact same thing happens when I attempt to install it. I have redownloaded it many times. I also have root and I'm running Android 5.1.1 EDIT: The message I get from terminal is: [INSTALL_FAILED_VERIFICATION_FAILURE]