Later versions of the plugin will tell you how to fix this. I think we introduced the fix in 0.8 so you should probably upgrade. Then the fix is to put this in your build.gradle
android {
packagingOptions {
exclude 'META-INF/services/javax.annotation.processing.Processor'
}
}
This will exclude this file from the packaging which is fine since it's not actually needed in the APK.