title: Cannot resolve symbol Theme, ThemeOverlay
body: <p>I updated my android studio to latest version - 3.0.1. Since then it complains 'Cannot resolve symbol' for Theme and ThemeOverlay in the following lines of code. 
  App runs fine but they are marked in RED in the file.</p>
  
  <p><strong>styles.xml</strong></p>
  
  <pre><code>&lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;&lt;/style&gt;
   &lt;style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" /&gt;
      &lt;style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" /&gt;
  </code></pre>
  
  <p>build.gradle is updated with the latest version</p>
  
  <pre><code> dependencies {
          classpath 'com.android.tools.build:gradle:3.0.1'
      }
  </code></pre>