title: Issue after Android studio update
body: <p>I just tried to update Android studio from 1.4 to 2.2 preview 2. After updating Android Studio, when I tried to open it, it showed me this error:</p>
  <blockquote>
  <p>Error:(1, 1) A problem occurred evaluating project ':app'.</p>
  <p>java.lang.UnsupportedClassVersionError: com/android/build/gradle/AppPlugin : Unsupported major.minor version 52.0</p>
  </blockquote>
  <p><a href="https://i.stack.imgur.com/T4fav.png." rel="noreferrer"><img src="https://i.stack.imgur.com/T4fav.png." alt="enter image description here" /></a></p>
  <p>Can any one help me to resolve this?</p>