Specific game with vibration capabilities not working due to something with AndroidManifest.xml

So, I got the "Intense Vibration for Android" package from the asset store so I can use my phone's vibration in one of my games. However, with this package imported, the APK refuses to install! Without it the game works just fine, and if I delete the plugins folder that contains AndroidManifest.xml it works just fine (minus the null reference exceptions when I want it to vibrate), and the weird thing is... If I make a separate project that only has that package and a test scene, everything works! Even weirder, if I make a copy of the game and delete everything except the package, it DOESN'T work! Any suggestions as to what hidden things might be going on and how to fix them?