title: Android Studio cant run app on emulator
body: <p>My Android Studio can start the emulator but then cant initialise the app. 
  At first I start emulator through "Android Virtual Device Manager", then I click on "Run" button and select the "online", already launched and initialised, emulator. </p>
  
  <p>On "messages" tab i receive the following message:</p>
  
  <blockquote>
    <p>Error:no devices found</p>
  </blockquote>
  
  <p>I also tried to start emulator by selecting "Run" button and selecting the emulator I want to start, but the result is the same.</p>
  
  <p>Any ideas on how to fix this problem?</p>