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.
1. Open Android SDK Manager.
2. Go to Tools → Options.
3. Click on Clear Cache → Close.
4. Go to Packages → Reload.
You should now see more packages available under "Android 4.2 (API17)" and you should be able to install them without a problem.
I had this problem yesterday when I updated Eclipse and not the Android SDK. Ensure that your Android SDK is updated. Otherwise you might want to look at this answer..
Android ADT error, dx.jar was not loaded from the SDK folder
It was happening to me as well, try closing and relaunch eclipse.
Clean the project and run.
It works for me.
In my case there was no lib folder in platform-tools folder, so I just create a new lib folder in platform-tools folder and paste dx.jar which I had found in buildtools folder in that lib folder.......And its work for me :)
