Android gradle project - Proguard -

i migrated android eclipse project android gradle project , have issues proguarding:

java.io.ioexception: can't write [build\intermediates\classes-proguard\release\classes.jar] (can't read [\build\intermediates\exploded-aar\unspecified\jars\libs\libgoogleanalyticsv2.jar(;;;;;;!meta-inf/manifest.mf)] (duplicate zip entry [com/google/a/a/a/a.class == libgoogleanalyticsv2.jar:com/google/analytics/tracking/android/tracker.class]))

my app broken out different modules. have main android application "app" , dependencies android-libraries. debating whether approach because of inter dependencies: app depends on library1 , library2. library 1 depends on library2 also. bad? isn't circular dependency don't think.

also library1 , app have dependencies on same external jar proguard complaining about, libgoogleanalyticsv2.jar. reason getting error?