title: Flex ANT tasks can't find my assets
body: <p>I'm attempting to compile my Flex project with an ANT build script.</p>
  
  <p>One of my MXML components references an external XML data file, like this:</p>
  
  <pre><code>&lt;mx:XML id="treeData" source="assets/data/help.xml" /&gt;
  </code></pre>
  
  <p>When I build the project using Flex Builder, it compiles fine. However, when I try to compile it using ANT, I get the following error:</p>
  
  <pre><code>Error: Problem finding external XML: assets/data/help.xml
  </code></pre>
  
  <p>How come ANT isn't finding the XML file? Apparently it knows the source path otherwise it would not have found the component to begin with. I added the source path to the target anyway, but it doesn't seem to have made any difference:</p>
  
  <pre><code>&lt;source-path path-element="${SRC}" /&gt;
  </code></pre>
  
  <p>Any ideas?</p>