title: Error #2077: This filter operation cannot be performed with the specified input parameters
body: <pre><code>Error #2077: This filter operation cannot be performed with the specified input parameters.
    at flash.display::BitmapData/applyFilter()
  </code></pre>
  
  <p>I got this error message trying to apply a <code>BitmapFilter</code> (specifically an inner <code>DropShadowFilter</code>) to a <code>BitmapData</code> via <code>.applyFilter</code></p>
  
  <p>I've never seen this message before and Googling did not immediately answer the question, and I saw someone confounded as to why it applied to JPEG and not PNG images.  So hopefully this question will help someone else.  I'll include my simple solution below.</p>