title: Apply Changes Button Grayed out: Android Studio
body: <p>I have set up my project's <code>minSdkVersion</code> as 15 and enabled <code>Instant Run</code> .<br>
  I have deployed the app in my device running on API 21 
  But the "Apply Changes" button is grayed out.When I hover over the button it says "No Active 'App' launch" although I am running the app in my device at that time . </p>