多个dex文件定义了Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat$AccessibilityServiceInfoVersionImpl;

I have seen this error in multiple forums and related answers to it, I tried all but it didnt seem to work in my case. Let me give brief about my environment. I am running Gradle 2.4 on mac osx 10.7.5 with sunjdk 1.7 and androidsdk 21. My android project is setup in eclipse juno and i am trying to build it in terminal using "gradle clean", "gradle build" command.I have seen this error in multiple forums and r