title: Flash Builder launch failed - invalid application descriptor: Unknown namespace
body: <p>I'm having difficulty getting a Flex mobile project to run on my machine. When I try and run the project I get the following error:</p>
  
  <blockquote>
    <p>Process terminated unexpectedly.</p>
    
    <p>invalid application descriptor: Unknown namespace:
    <a href="http://ns.adobe.com/air/application/16.0" rel="nofollow">http://ns.adobe.com/air/application/16.0</a></p>
    
    <p>Launch command details:  "C:\Program Files\Adobe\Adobe Flash Builder
    4.7 (64 Bit)\sdks\4.6.0\bin\adl.exe" -runtime "C:\Program Files\Adobe\Adobe Flash Builder 4.7 (64
    Bit)\sdks\4.6.0\runtimes\air\win" -profile mobileDevice -screensize
    320x460:320x480 -XscreenDPI 163 -XversionPlatform IOS
    "C:\Users\dean.grobler\Adobe Flash Builder
    4.7\ProsperityHealth\bin-debug\ProsperityHealth-app.xml" "C:\Users\dean.grobler\Adobe Flash Builder
    4.7\ProsperityHealth\bin-debug"</p>
  </blockquote>
  
  <p>I'm using Flash Builder 4.7. I've tried to read up on similar issues on the web but the few answers that I'm finding either don't work or are very vague.</p>