title: In eclipse-Android 4.2-Unable to build: the file dx.jar was not loaded from the SDK folder
body: <p>I have updated Android 4.2 SDK using SDK Manager and ADT 21.0.0.v201210310015-519525 in Eclipse(Indigo).</p>
  
  <p>I have created a New project,build and try to run this. I got error as </p>
  
  <p>[2012-11-15 11:38:19 - MyApp] Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!</p>
  
  <p>How to solve this issue? I have googled lot.But i am not found any correct way to solve this issue. I have clean project and tried,that also not works.</p>