App not installed after signed apk

Question

I'm trying to install my signed apk, generated from Android Studio 1.5.1, I can not understand why the release version I can not install it, I set debuggable to false, I have only one MainActivity in the Manifest.xml, all looks ok, but the .apk do not install, anyone can explain to me why?

P.S

I uninstalled the debug version of my phone

Answer 1

I've solved by launch:

adb uninstall my.package.id

The app was already uninstall but the data had remained somewhere