In my apk running in ARC welder I get:
java.lang.UnsupportedOperationException: Device does not have package com.google.android.gsf at com.google.android.gcm.GCMRegistrar.checkDevice(GCMRegistrar.java:98)
I get this despite having the following in Additional Metadata:
{ "usePlayServices": ["gcm"], "crx_key": ... } .
What do I need to do to get this working?