The JSON library probably doesn't work with Android, then...
I'm guessing that this is a continuation of your earlier post... you're probably out of luck.
You could try browsing the source code or contacting the developer of the library to see why it isn't compatible...

Hey, getting the exact same error in a completely different situation. What seems to trigger this in my situation is when I try to call any functions from any android classes in a processing project. But I think it could be a general error when the Android build fails and it doesn't know why but its because we are trying to do something that we can't. That's probably what resides within the JSON library.. so unless your willing to break that open and try figure it out..

JSON is already part of Android core libraries, so you shouldn't need any extras.

See http://developer.android.com/reference/org/json/package-summary.html for more details. Example sketch below works for me - both with external library and without on processing 2.0b5.

1. import org.json.*;
   
   void setup(){
     JSONObject obj = new JSONObject();
   }
   
   void draw(){
   }