title: attribute is not allowed
body: <p>i started android studio 3.2 recently and when i create a new project it fails syncing and gives error that content is not allowed in prolog and the error was in xml file where it gives an error that attribute android layout is not allowed. i tried many solution provided here but it didn't workout.   </p>
  
  <pre><code>   &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.constraint.ConstraintLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".MainActivity"&gt;
  
  &lt;TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Hello World!"
      app:layout_constraintBottom_toBottomOf="parent"
      app:layout_constraintLeft_toLeftOf="parent"
      app:layout_constraintRight_toRightOf="parent"
      app:layout_constraintTop_toTopOf="parent" /&gt;
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>