I've seen some questions about it ( Question 1 and since I can't use gradle in eclipse, I don't know another option) but I don't have any idea to solve it.
So, here is the thing: I updated my ADT and my Play Services to implement the new way to get the user's location (I'm using ADT). Since I did it, I'm facing the problem that I have more than 65k methods in my project. I tried to change the proguard as Android Developers recomends, but nothing happens. So, maybe the proguard isn't enabled in my Android app! I tried to see it here, but I realized that I don't have the proguard.cfg file in any of my projects!
How can I solve it? I just use few things in Play Services (GCM and Location).