Proguard errors with external jar - returns error code 1

Question

While exporting my Android Application, Proguard returned with error code 1. I am using twitter4j external jars in my app.

I already added library jars, rt.jar (For

Answer 1

I guess Android does not support jdk 1.7, May be that's your problem. Can the Android SDK work with JDK 1.7?