title: Project in Android Studio won't start - Activity Class Not Specified
body: <p>According to new IDE for android I decided to import projects from my old eclipse.
  Unfortunatelly I cannot run them because of information <code>Error: Activity Class not specified</code> This error can be found I user reproduce steps:</p>
  
  <ol>
  <li>From top bar menu choose Run (ALT+U)</li>
  <li>Edit configuration... (ALT+R)</li>
  <li>Choose or add Android application</li>
  <li>In General tab choose project in <code>Module navigation list</code></li>
  <li>Here I do not know what to choose <code>Launch default activity</code> or <code>Launch</code></li>
  </ol>
  
  <p>No matter what I do, I still get at the bottom of <code>Run/Debug Configurations</code> windows error.
  How am I supposed start my android projects?</p>