proguardRelease FAILED when compiling apk with assembleRelease in Android Studio
Add this to ProGuard setting file(like proguard-rules.pro)
-dontwarn okio.**
I had to disable proguard with
minifyEnabled false
Not the best solution, but it works.
Add this to ProGuard setting file(like proguard-rules.pro)
-ignorewarnings
I had the same problem with Gradle 1.1.0. It remembered some old class references which I have moved, and I couldn't build apk.
Try Build > Clean.
It helped me, and now I can build apk again.