title: md-form-field must contain a MdFormFieldControl
body: <p>I am trying to insert an input field in my component using <code>angular-material2</code>. This is my HTML:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;md-form-field&gt;
      &lt;input type="text"&gt;
  &lt;/md-form-field&gt;
  </code></pre>
  
  <p>In the console, I get this error but I don't understand why I get the error:</p>
  
  <blockquote>
    <p>md-form-field must contain a MdFormFieldControl. Did you forget to add mdInput to the native input or textarea element?</p>
  </blockquote>