[android-developers] In eclipse-Android 4.2-Unable to build: the file dx.jar was not loaded from the SDK folder!

I have updated Android 4.2 SDK using SDK Manager and ADT 21.0.0.v201210310015-519525 in Eclipse(Indigo).

I have created a New project,build and try to run this. I got error as 

[2012-11-15 11:38:19 - MyApp] Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!

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.

- 

BY

R.RAMPRASAD

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