title: Installation failed with message null
body: <p>I have a problem with android studio and genymotion.
  I have a AMD processor that doesn't not support vt-x that is why i use genymotion.
  When I try to launch my simple app I get this error:</p>
  
  <blockquote>
    <p>Installation failed with message null.
    It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.
    WARNING: Uninstalling will remove the application data!
    Do you want to uninstall the existing application?</p>
  </blockquote>
  
  <p>I have:
  Windows 7
  Android Studio 2.1.2
  VirtualBox 5.0.20</p>
  
  <p>Please need some help !</p>