title: Cannot resolve symbol "parent" in Constraint Layout
body: <p>I created a new project in Android Studio 2.3.2 and getting this error <code>String types not allowed (at 'layout_constraintBottom_toBottomOf' with value 'parent').</code>
  Similarly for <code>toLeftOf</code>,<code>toRightOf</code> and <code>toTopOf</code>.</p>
  
  <p><a href="https://i.stack.imgur.com/8vgDY.png" rel="nofollow noreferrer">Code</a></p>