Uncaught translation error: com.android.dx.cf.code.SimException: com.android.dx.rop.cst.CstMethodRef cannot be cast to com.android.dx.rop.cst.CstInterfaceMethodRef
Warning:can't write resource [.readme] (Duplicate zip entry [classes.jar:.readme]) Uncaught translation error: com.android.dx.cf.code.SimException: com.android.dx.rop.cst.CstMethodRef cannot be cast to com.android.dx.rop.cst.CstInterfaceMethodRef I had to revert to 7.8 to fix things and move on with life. It will be great when all of this gets sorted out. I am surprised a major release in incompatible with proguard. Hopefully this will be resolved soon. Use play store version to compile 'com.google.android.gms:play-services:7.8.0' latest version has this issue . Also change app target version to targetSdkVersion 21