title: amp-img error: Layout not supported for: container
body: <p>Trying to validate my amp-img. In this example: <a href="http://staging.laineygossip.com/Sasha-Celeb-Finds-Sienna-Miller/Lifestyle/24695/amp#development=1" rel="noreferrer">http://staging.laineygossip.com/Sasha-Celeb-Finds-Sienna-Miller/Lifestyle/24695/amp#development=1</a></p>
  
  <p>I get the error: <code>Layout not supported for: container</code><br/>
  In the console, the error is: <code>The specified layout 'CONTAINER' is not supported by tag 'amp-img'</code></p>
  
  <p>Not sure what this error means.</p>
  
  <p>So far I can't find anything in the docs that relates to this error message.</p>