title: Android Studio "The following classes could not be found" error
body: <p>I am using Android Studio, freshly downloaded yesterday, and whenever I attempt to use the <code>&lt;shape&gt;</code> class, I get an error.</p>
  
  <p>The code:</p>
  
  <pre><code>&lt;shape xmlns:android="http://schemas.android.com/apk/res/android"
      android:shape="rectangle"
      android:layout_width="100dp"
      android:layout_height="100dp"&gt;
      &lt;solid android:color="#eeffffff" /&gt;
      &lt;corners android:bottomRightRadius="8dp"
          android:bottomLeftRadius="8dp"
          android:topRightRadius="8dp"
          android:topLeftRadius="8dp"/&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>The problem:</p>
  
  <pre><code>Rendering Problems
  The following classes could not be found:
  
  - shape (Fix Build Path)
  - solid (Fix Build Path)
  
  Tip: Try to build the project
  </code></pre>
  
  <p>None of the solutions in a multitude of other questions on stackoverflow have helped - I am in desperate need of an actual solution to my problem. What am I doing wrong? The <code>build</code> in <code>Tip: Try to build the project</code> is a link, but whenever I click it, <em>nothing happens</em>. On the other hand, when I click on <code>(Fix Build Path)</code>, I get taken to a new window which shows tabs, including <code>properties</code>, <code>signing</code>, <code>flavors</code>, <code>build types</code> and <code>dependencies</code>; I have <strong>absolutely no idea what any of this means</strong>. Please help!</p>