title: Android SDK  tools revision 12 has problem with Proguard => error conversion to Dalvik format failed with error 1
body: <p>I have just updated to Android SDK tools revision 12, immediately my application can't be exported with previous Proguard setting. I received the "Conversion to Dalvik format failed with error 1", the only library I use is "jcifs". I have tried cleaning and rebuilding, create a new project, and reassembling and I believe I have done almost anything I can read in the Internet. 
  Is this a new bug from this new SDK? I suggest don't update for the time being if your project use Proguard. </p>
  
  <p>UPDATE 1: 
  I also tried to export a simple Hello application with proguard set, still the same message. It looks like something is broken with this version of SDK tool.</p>
  
  <p>UPDATE 2:
  I have to delete the whole tools folder in SDK directory and copy a backup of SDK tools revision 11 into it. At least I can go back to work and export with proguard works again. I hope this information helps whoever in the same situation. I still have no idea what is going on though, hope someone can shed a light on this annoying issue.</p>
  
  <p>UPDATE 3:
  I have reported this issue as a bug here: 
  <a href="http://code.google.com/p/android/issues/detail?id=18359">http://code.google.com/p/android/issues/detail?id=18359</a>
  hope someone takes a good look at the issue, until then you will be advised to stay out of this version if you are using Proguard in your development.</p>