title: Android Studio Failed to find target with hash string 'android-26'
body: <p>I've installed latest Android Studio and 
  - I've created new project for sdk 25
  - I have sdk 25 installed</p>
  
  <p>I have this issues:</p>
  
  <ul>
  <li>first of all, I don't see Tools > Android > AVD Manager. So I have no idea how can I set up additional AVD</li>
  <li>second: I get this error in console</li>
  </ul>
  
  <blockquote>
    <p>Error:Failed to find target with hash string 'android-26' in: C:\Android
    Install missing platform(s) and sync project</p>
  </blockquote>
  
  <p>Why is it complaining about version 26? I have project with api 25 set up?</p>